1. can be done within in 1 month but don't make it in the neck of the period.
2. For Gents & Ladies they have a separate entrance and it wont take more time, if they are aged, they give the preference to move fast.
3. take your parent's original passport + copy + visa copy + ATM / CREDIT Card for fee + your passport & QID. there is no specific form for visit visa extension
purpose.