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Recovery after hernia open surgery
I would say start slow and take it easy. At 4 weeks/1 month the would might have healed 80% but there is no real need to go 100% full fledge sports. 2 months would be good idea.
If I were you, I would do the basic things like stretching, brisk walking and may be some jog. Once that feels good I will go to Cricket and running between the wickets. If you are a fast bowler take it easy, give it two months. Listen to your body and give it rest when it needs. Do not overdo it.