In rebuild I have it set to 3 rounds makes a turn and 5 turns makes a game. I have noticed that some people feel it is to short and some think it is just right.
I would think that allowing players to add a round in order to get better begin turn bonuses would be nice as well as letting them add 1 additional turn to help extend the game a touch. 1 way would add 5 action sequences and the other way would add 3. Both ways would adjust the feel, but just a touch.
I like the idea of letting players customize the experience slightly, but not in a massive way. Some people like it tight and some like it loose.
The terminology is not really important for the question. You also take 2 actions when you take actions so for now you take 30 actions per game. Also not totally about my game. Just wondering an the grand scheme of things is a suggestion about how to adjust game length acceptable. I know some people say, "figure it out before you publish. It is not the players job to define the game."