No offense but I find it hard to believe that you had 3 hour long lucid dream. At least personally I will wake up after my REM-period is over if I am lucid. Since you don't remember everything, it might be that you were lucid for a small time and it felt like many hours. Rest of the sleep continued as normal non-lucid sleep and when you woke up you feel like you would've been lucid very long. Your brain can trick you easily to think that you had hours long lucid dreams, I have felt that too

Otherwise, congratulations if that all happened