Sale and purchse of a flat in askari i lahore

Dear mr realtor
I want to sell my apartment at 3rd floor in askari i and buy same type on 1st or 2nd floor in askari i.

Please advise me :-
1 how much time will it take to finishe/complete this sale / purchase deal?

2 how much additional money do i need to pay?

Regards

Yours
Muhammad m baig
Email: pak5376@yahoo.Com