[JugglingReferee]

30 minutes for high school. But in the area that I work, people often have to leave work early do to the JV/V double header. With that it mind, it is permissible to be less than 30 minutes early. Generally, if you're going to be 25-30 minutes early, no problem, but something around 15-20 minutes, your P must know ahead of time - and it shan't be a regular occurance. Less than 15 is a no-no. However, we're short of officials, and good officials, so when it comes down to having people at the game or not. . .

All-star tournaments on the weekend are different again. There is SO MUCH basketball, that it's not uncommon for officials to drive between sites with little break between games. Here, the expectation to arrive 30 minutes early is lifted, but otherwise 30 minutes is appreciated, but many guys arrive 15 minutes early.

College is 90+ minutes.

Contrary to MTD's approach, the ruleset doesn't dictate how early we are: but rather the type of game does. Obviously college demands a more intense pre-game than 10 year olds, even if they're their city's all-star players.

On a side note, there's no way in hell I would arive before the JV, just in case one of the JV guys didn't show, and not get paid for that extra time. That's one of the most silliest things I've read.