G0LD:make it so, once started, a round can be completed without interruption.
No time limit?
o.k., I enter late, I do not save&quit, I leave the game window open and the avatar idling, do my business or other duties, enjoy a night out and come back next noon to continue...
...and a whole bunch of players wonders why it doesn't finish, or how to meet the schedule of the next rounds, delayed by an unknown time...
Now, if you introduce another time limit, I'd scream of annoyance and frustration!
I see no alternative to the current deadlines, and the information given on the site are there for ev1 to see - we should take responsibility, check them out and obey them.
Peace & have fun!