that topic is called “Longest lucid dream (in dream time)”, but discusuion came into 100 years dream: [Longest lucid dream (in dream time)?)
And this is right “A 100 years dream” topic:
https://community.ld4all.com/t/a-100-year-dream/22806
Getting stuck is not possible, never heard that anyone had it, logic says that it is not a danger. However, extending dreamtime is possible, but need loads of control, training, an experience.