I guess it depends on how much is assigned, but on average it should take no more than half an hour to finish.
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You should expect to review a good deal of what you learned in Grade-7 math, and then go quite a bit farther ... somewhat past the point where Grade-9 math will begin.
Wolfram Alpha, should be able to solve any math you can throw at it.
I'm not sure if this website has a whole long of practice problems, but it should be pretty useful for a 7th grader.
You have to be in eight grade to do eight grade math. Except if you are very smart.
You could talk to your advisor, although, with that attitude, it won't be long.