Yeah I've been thinking about that too.

So (IMHO) it is better to put the 'limit' of conquered provinces per leader/player to 10. I guess that leaves still enough time for everyone who signed up to complete a reign and still go for the 50 provinces + Rome in the end.

My faction leader died @ 8 provinces, so in theory Quietus' campaign can end at 18 provinces. His faction leader is in his 40s so I think conquering 10 provinces during that time-frame is okay.