Well, if we're talking in-game time (and I assume you are), then it's 3 days travel (if not aided by magic), then I figure 2-3 days tracking the bandits, subduing them, and collecting rewards (the bandits won't be too far away from their source of "income", so there shouldn't be too much travel time involved in tracking them). So unaided, we're talking 8-9 days. On the other hand, if the job postings go up in the Guild Hall on Mondays, then that means if any of us want work for the next week, then we need to complete the job in a week. Any longer and we'd be out of work for the next week.
And Bharash is ready to leave at any time, so nothing for me to discuss before hand.