Does I 20 visa permits for service, if yes how much hours?

Question

Does I 20 visa permits for service, if yes how much hours?

Answer 1

Sorry, but you need to restate your question. At the moment, it doesn't appear to make any sense. Among other things, there is no I-20 visa. The I-20 is a form for students. Foreign students on F visas can work up to 20 hours on campus. To work off campus they need permission.

Answer 2

Are you asking about working in the US while on an F1 visa?  If so, it is possible, to a degree, but there are very strict reqirements.  Check with your Designated School Official (DSO) for more details.