I'm personally split on round timers. For every Jess/Mira 2, I feel like I've seen many more fights that are just two inexperienced girls fighting to the point of mutual exhaustion where very little "action" is taking place. It also can be unsafe if you have two amateurs with no experience fighting for an indefinite period of time. Many fights often just devolve into them laying on one another and both not having the strength to really put in any offense. No one who isn't a professional has the cardio to "authentically" fight for an extended amount of time. "Marathon" catfights have the potential to devolve in to the "faux-fight" category if neither have the stamina to put in any offense.
On the other hand, Jess/Mira 2 is my favorite catfight of all-time. So...yeah. Don't really have a strong preference either way as sometimes you'll get a 20+ minute dud of a fight of two exhausted fighters two tired to put in any offense or you'll get a 40+ minutes of two dueling where it would tough to pull them apart as they want to keep going.
So, here's my compromise:
NO Round limits, but it's up to Suitefights/or some referee to use their discretion when there should be a "natural" break. If one girl is dominating the other, the fight should not be broken up until the other submits. No being saved by a bell.
On the other hand, if the "referee" deems there is no action taking place and neither has an advantage, then there should be a break to reset the fight. Breaks, like in MMA, should be rare as you want the two to settle a fight naturally, but a perpetual stalemate where there is no action is not what anyone wants to see.
On a submission or when a "break" occurs, give both ample time to rehydrate and recover so they can come back strong for when the fight resumes.