ANSWER:

You can leave anytime you want but you will lose the reward of praying the whole night if you leave without completing the witr with them. 

In our masjid there is 20 rakaat taraweeh + 3 raakat salatul witr in jamaat. If I attend the taraaweeh jamaat, do I have to stay with the jamaat untill it ends or may I leave anytime I feel like leaving?

Prayer, Taraweeh, Tahajjud and Qiyam-ul-Layl | April 8, 2022 7:40 am
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My masjid prays taraweeh really fast and prays witr like maghrib. Is my prayer valid if my Imam recites Fatiah very fast and unclear? Do I need to pray in different masjid?
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A woman who doesn’t go to masjid, what is the ideal way to pray qiyam ul layl for her in Ramadan? Which one is the best? 1.5 hours after Isha and 1.5 hours at the last third of the night? Or 3 hours of prayer at the last third of the night and no taraweeh?