I've got a h1b transfer receipt and the new employer wants me to join asap. Even though the company is good and immigration team is also good, there's still a small risk of the h1 transfer getting denied. What if I do not inform the old employer and take a paid vacation which I have pending until my h1 transfer petition decision is made.(4-5 weels) Is it legal to work for new employer using h1 transfer receipt and also receive pay stubs from old employer-- translates to working for both employers with one approved h1 and h1 transfer receipt.
Assuming it's legal to do this, is there a time duration before which I need to inform my old employer that I have quit my job?