Wrong Volunteer Hours on Application?

Colleges and Universities A-Z Stanford University
1

I submitted an early application to Stanford that indicated that I volunteered during 10,11,12 grades 6hrs/wk and 30wk/year when in reality it turned out to be 11,12 grades 6hrs/wk and 22wk/year

Is it worth the trouble to contact admission to change these numbers?

2

That is a very large discrepancy. how come?

3

Correction: I just need to change the weeks/year from 30 to 22.

I simply overestimated and then only today checked in with how many hours I actually have (~100)

I also realize I posted in the wrong section.