Forthcoming patch notes

[llamabeast]

Only a small proportion of battles last 50 turns, so only a small proportion would be affected. Also, the majority of the processing time is often spent on the early turns of a battle, when there are more units alive and more mages awake.

So I would suggest that the effect on the processing time of a turn would not be that large.

Personally, I would be very much in favour of including an option for the battle turn limit. I can't see any disadvantages, and I expect that the majority of multiplayer hosts would choose a higher limit than the current 50 turns.