L1 Ext, H1 in RFE Response review

Applied for L1B ext, which is in RFE status, sent response on sept 20,

Applied for H1 which is in RFE Response Reciew since Sept 18.

  1. Can I stay, if L1 ext rejects after Oct 1 and H1 status is still in RFE Response Reciew ?

  2. My H1 emplyoer says I can stay but can not work till approval of H1.

  3. If L1 extension approves and H1 also get approved, is it necessary to switch employment with H1 employer ? how much (max) time I have to switch my employment ?

Thanks !