Going to Goa
That can take as long as you have, lots of fun places on the way. Driving non stop you could do it in 3 weeks, maybe a bit less, but three months would be better. Via Italy ex Yugoslavia, Bulgaria, Turkey, Iran, Pakistan is the shortest. But Austria, Hungary, Romania, Bulgaria are all good to visit (but not in the winter) or via Albania and Greece or Ukraine and Georgia, this is the route less travelled, but I would recommend a few weeks in Turkey, good food and lovely coast along the Eastern Med.('tho diesel is expensive) And don't rush through Iran, lovely people and architecture.