I don't have much experience but I'm going through the engine in my boat right now. Pulled the engine and had it totally disassembled to the bare block in 7 hours 30 minutes so I'd think if you were just changing the one piston you could have it done in a day pretty easy. Only thing would be you'd have to see if it messed up the cylinder wall (easy enough to do by just pulling the head) but best case scenario you could get away with a new piston and rings and rehoning the cylinder wall.
'87 Super Comp, 408W stroker motor