At first, I though maximum of 16hours would suffice to get it back to a better level, but I encountered buffer hop and the polish was gumming up faster than normal. But a tweak in polishing method and also the product application process helped to solve it.
I spent a minimum 16hours on the paint itself plus another 8hours on other parts (engine, interior, wheels, etc) - span of 3 days.
So here goes...
Day 1: Pictures taken during various time span
EXTERIOR BEFORE
Looks ok right? Wait till you shine a light on it