There is no official time-frame. Everyone who joins, unless they come in with a verifiable resume, starts at the Middle School/JV level. If you can umpire with proficiency, you move up quickly, possibly in your first year. If you can't call at all, you will be let go fairly soon. If you are in-between, you will stay at the MS/JV level.
Prior experience on the varsity level in another sport is a plus, as that demonstrates an ability to deal with sticky situations.
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