diff --git a/AdventOfCode.lpi b/AdventOfCode.lpi
index 2f2263e..327f6ee 100644
--- a/AdventOfCode.lpi
+++ b/AdventOfCode.lpi
@@ -53,6 +53,10 @@
         <Filename Value="solvers\UGiveSeedFertilizer.pas"/>
         <IsPartOfProject Value="True"/>
       </Unit>
+      <Unit>
+        <Filename Value="solvers\UWaitForIt.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
     </Units>
   </ProjectOptions>
   <CompilerOptions>
diff --git a/AdventOfCode.lpr b/AdventOfCode.lpr
index 50b4adf..faab668 100644
--- a/AdventOfCode.lpr
+++ b/AdventOfCode.lpr
@@ -25,7 +25,7 @@ uses
   {$ENDIF}
   Classes, SysUtils, CustApp,
   USolver,
-  UTrebuchet, UCubeConundrum, UGearRatios, UScratchcards, UGiveSeedFertilizer;
+  UTrebuchet, UCubeConundrum, UGearRatios, UScratchcards, UGiveSeedFertilizer, UWaitForIt;
 
 type
 
@@ -55,6 +55,7 @@ begin
   engine.RunAndFree(TGearRatios.Create);
   engine.RunAndFree(TScratchcards.Create);
   engine.RunAndFree(TGiveSeedFertilizer.Create);
+  engine.RunAndFree(TWaitForIt.Create);
   engine.Free;
 end;
 
diff --git a/solvers/UWaitForIt.pas b/solvers/UWaitForIt.pas
new file mode 100644
index 0000000..d04a681
--- /dev/null
+++ b/solvers/UWaitForIt.pas
@@ -0,0 +1,107 @@
+{
+  Solutions to the Advent Of Code.
+  Copyright (C) 2023  Stefan Müller
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <http://www.gnu.org/licenses/>.
+}
+
+unit UWaitForIt;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, fgl, Math, USolver;
+
+type
+
+  { TWaitForIt }
+
+  TWaitForIt = class(TSolver)
+    FTimes, FDistances: specialize TFPGList<Cardinal>;
+  public
+    constructor Create;
+    destructor Destroy; override;
+    procedure ProcessDataLine(const ALine: string); override;
+    procedure Finish; override;
+    function GetDataFileName: string; override;
+    function GetPuzzleName: string; override;
+  end;
+
+implementation
+
+{ TWaitForIt }
+
+constructor TWaitForIt.Create;
+begin
+  FTimes := specialize TFPGList<Cardinal>.Create;
+  FDistances := specialize TFPGList<Cardinal>.Create;
+end;
+
+destructor TWaitForIt.Destroy;
+begin
+  FTimes.Free;
+  FDistances.Free;
+  inherited Destroy;
+end;
+
+procedure TWaitForIt.ProcessDataLine(const ALine: string);
+var
+  split: TStringArray;
+  list: specialize TFPGList<Cardinal>;
+  i: Integer;
+begin
+  split := ALine.Split([' ', ':']);
+  if split[0] = 'Time' then
+    list := FTimes
+  else if split[0] = 'Distance' then
+    list := FDistances
+  else
+    Exit;
+
+  for i := 1 to Length(split) - 1 do
+    if split[i] <> '' then
+    begin
+      list.Add(StrToDWord(split[i]));
+    end;
+end;
+
+procedure TWaitForIt.Finish;
+var
+  i, x1, x2: Integer;
+  p, s: Double;
+begin
+  FPart1 := 1;
+  for i := 0 to FTimes.Count - 1 do
+  begin
+    p := FTimes[i] / 2;
+    s := Sqrt(p * p - FDistances[i]);
+    x1 := Math.Floor(p - s + 1);
+    x2 := Math.Ceil(p + s - 1);
+    FPart1 := FPart1 * (x2 - x1 + 1);
+  end;
+end;
+
+function TWaitForIt.GetDataFileName: string;
+begin
+  Result := 'wait_for_it.txt';
+end;
+
+function TWaitForIt.GetPuzzleName: string;
+begin
+  Result := 'Day 6: Wait For It';
+end;
+
+end.
+
diff --git a/tests/AdventOfCodeFPCUnit.lpi b/tests/AdventOfCodeFPCUnit.lpi
index 4a9673f..f8c7705 100644
--- a/tests/AdventOfCodeFPCUnit.lpi
+++ b/tests/AdventOfCodeFPCUnit.lpi
@@ -64,6 +64,10 @@
         <Filename Value="UCubeConundrumTestCases.pas"/>
         <IsPartOfProject Value="True"/>
       </Unit>
+      <Unit>
+        <Filename Value="UWaitForItTestCases.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
     </Units>
   </ProjectOptions>
   <CompilerOptions>
diff --git a/tests/AdventOfCodeFPCUnit.lpr b/tests/AdventOfCodeFPCUnit.lpr
index e21dae5..3df24ee 100644
--- a/tests/AdventOfCodeFPCUnit.lpr
+++ b/tests/AdventOfCodeFPCUnit.lpr
@@ -4,7 +4,7 @@ program AdventOfCodeFPCUnit;
 
 uses
   Interfaces, Forms, GuiTestRunner, USolver, UBaseTestCases, UTrebuchetTestCases, UCubeConundrumTestCases,
-  UGearRatiosTestCases, UScratchcardsTestCases, UGiveSeedFertilizerTestCases;
+  UGearRatiosTestCases, UScratchcardsTestCases, UGiveSeedFertilizerTestCases, UWaitForItTestCases;
 
 {$R *.res}
 
diff --git a/tests/UWaitForItTestCases.pas b/tests/UWaitForItTestCases.pas
new file mode 100644
index 0000000..f1242d8
--- /dev/null
+++ b/tests/UWaitForItTestCases.pas
@@ -0,0 +1,89 @@
+{
+  Solutions to the Advent Of Code.
+  Copyright (C) 2023  Stefan Müller
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <http://www.gnu.org/licenses/>.
+}
+
+unit UWaitForItTestCases;
+
+{$mode ObjFPC}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, fpcunit, testregistry, USolver, UBaseTestCases, UWaitForIt;
+
+type
+
+  { TWaitForItFullDataTestCase }
+
+  TWaitForItFullDataTestCase = class(TEngineBaseTest)
+  protected
+    function CreateSolver: ISolver; override;
+  published
+    procedure TestPart1;
+    procedure TestPart2;
+  end;
+
+  { TWaitForItExampleTestCase }
+
+  TWaitForItExampleTestCase = class(TExampleEngineBaseTest)
+  protected
+    function CreateSolver: ISolver; override;
+  published
+    procedure TestPart1;
+    procedure TestPart2;
+  end;
+
+implementation
+
+{ TWaitForItFullDataTestCase }
+
+function TWaitForItFullDataTestCase.CreateSolver: ISolver;
+begin
+  Result := TWaitForIt.Create;
+end;
+
+procedure TWaitForItFullDataTestCase.TestPart1;
+begin
+  AssertEquals(4811940, FSolver.GetResultPart1);
+end;
+
+procedure TWaitForItFullDataTestCase.TestPart2;
+begin
+  AssertEquals(-1, FSolver.GetResultPart2);
+end;
+
+{ TWaitForItExampleTestCase }
+
+function TWaitForItExampleTestCase.CreateSolver: ISolver;
+begin
+  Result := TWaitForIt.Create;
+end;
+
+procedure TWaitForItExampleTestCase.TestPart1;
+begin
+  AssertEquals(288, FSolver.GetResultPart1);
+end;
+
+procedure TWaitForItExampleTestCase.TestPart2;
+begin
+  AssertEquals(-1, FSolver.GetResultPart2);
+end;
+
+initialization
+
+  RegisterTest(TWaitForItFullDataTestCase);
+  RegisterTest(TWaitForItExampleTestCase);
+end.