Frequently Asked Questions - L-1B Visa
As long as you work full time and on the job described in your L-1B while you are INSIDE USA, it does not matter how long you stay outside USA.
Smaller companies can have a tough time getting an L-1A.
What you are asking me has nothing to do with US immigration laws. This is a matter for an employment lawyer in the state where you are working. Under US immigration laws, you can resign in USA any time.
You will need to apply for an H-1 through the employer you wish to join. You should be able to apply for a change of status as a part of that process.
The time taken for L-1B holder who applies through PERM is the same as for anyone else from the country you were born in. No special case here, unless yo convert to L-1A and go through EB-1.
1. L-1B visas do not permit part time employment.
2. I think 35 hours each week (full time). Part time is not permitted.
3. Part time is not allowed under L-1B.