1-2 hours? HA! Took me at least six hours; this job was a b#$%. Had to figure out how to get the hard-to-reach nuts and bolts off, pull all the belts, coax off the old water pump, scrape off all the old gasket materials, and then put it all back together. The hoses were all stuck to the fittings and I had to split them with a knife to peel them off. I'm wondering if they've ever been changed; there's a light layer of sediment coating the inside of all the hoses.