In the final mission, you must make it to the other end of a very large map to do your final battle.
There is no explicit turn timer on this mission. However, the in-game dialogue would suggest that there is a sense of urgency in completing your mission as quickly as possible.
Are there any negative consequences for taking a lot of turns before starting the very last fight at the end of the map?
If not, players could just use a bunch of idle turns in between each battle to reset cooldowns on abilities.