It depends on several factors: are they Bowling on one lane or two? What is their pace of play like, what skill level are they? But roughly five bowlers on a single lane should be about to finish between 30-60 minutes per game. A little faster is using two lanes at the same time, alternating frames.
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On average a game lasts 10 to 15 minutes per bowler per game. So for four bowlers you are looking 45 minutes to an hour. Unless you are a slow bowler or you get distracted.
Depending on how good the bowlers are and the condition being bowled on, a single game could last anywhere from 45-60+ minutes.
Depends on the number of players on each team. Most leagues have 4-5 players and it generally takes about 2 1/2 - 3 hours to bowl a series of 3 games.