The most important guidelines for anything dealing with Qur’an are set by Allah and the Prophet:
1) you listen to the words attentively
2) you understand the full meaning of the words and composition of the verses and so on
While Taraweeh is in part a social activity in its very nature, it is also fully centered about reading and listening to Qur’an. Therefore the said guidelines above apply.
I cannot stand even for 2 Rak’a of long recitations of long Surahs, since my mind cannot focus and I do not understand the meaning of all the words and their compositions. Therefore within few minutes my mind dilly dallies and other thoughts occur.
As a result I attended the Traweeh but I did not remember Allah and I did something else other than its purpose.
Therefore my suggestions for my own Self, not an instruction to you, is to do what is the easiest that optimizes the two guidelines mentioned above.
I prefer to read 1 fully understood verse in each Rak’a and full understanding of Fatiha, and the duration easiest for my mind and my focus, therefore how the Rak’a numbers might add up that evening.
These are of course not perfect words and people do not like them, but I rather be honest in Presence of Allah, when it comes to Qur’an these days we are ignorant folk, all of us, and we need to face the fact and instead of acting to impress others or to make a point for others to see, pause to optimize the mentioned guidelines above.
Sadly for me to be truthful is far more suited than being pious.
Allah’s aid is most sought