It will start between 2 - 5 min before you have to leave the house to get to work / classes. Not earlier not later. It will stop exactly 2 - 5 min AFTER you've reached soaking wet to your destination.
An just in case you decide that today shall be the day you'll be late or that you'll wait for it to stop / start then decide. The rain's will also wait.
Ah...the little mysteries in the land of Manipal.