Do you think it would be a big deal if I were to leave my community service at a different time than usual?

I've been volunteering at good will for my community service. When I was filing out my papers with the manager, I put 2-5 as the time I can work. Also i put down 3 hours, so thats how many hours i work each day. I usually get a ride from my sister and show up just on time. She can't give me a ride today so I was gonna take a taxi. The thing is that sometimes it could take a while for the taxi to arrive, so I was gonna call at 1 and then I'll probably be there before 2 so I might be done before 5. Do you think as long as I work 3 hrs then it would be fine, even if it's before 5?

Do you think it would be a big deal if I were to leave my community service at a different time than usual?
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