Hi all,

Say if the HR calls me and "verbally" tells me that I am hired, and they are processing the documentation and approval .. Usually how long should I expect the documents to be ready?

Is there any chance during this waiting period, they reject me? (Probably due to company restructure / save cost etc?)

Usually it takes a week or two. Yes, they can still reject you during this period.

Do not tender your resignation until you have signed a letter of offer from the other company.

Yes and yes.  Basically, you and your company can terminate employment within 24 hours unless stated otherwise.

You negotiate counter offer before you sign the offer letter, not after.. You can renegade on it just like they can terminate but you spoil the relationship lo I guess..