Well I can sat this, when I bowl in a 5 man bowling league which there are 5 bowlers on each team, that would take about 4 hours give or take. Now since you have half of that and you can 3 bowlers on one lane and 3 bowlers on the other lane, it should take about 1 and a half. It should no take long just as long as people bowl at a good pace. People takes time when they buy and eat food or smoke outside and go to the bathroom. If the bowlers are getting strikes, the time will go faster. If everyone is on one lane then you may take longer than that. So if you can get 2 lanes would be better but one lane will take more time.