How many hours does it take to replace the timing belts (1984 Mondial QV)? I've looked all over the internet and see lots of links on how to replace them, but none say how long it takes in hours. I'm also talking only about the belts. I know there may be peripheral items that may need to be replaced when you open it up but I'm only looking for the belt replacement time. Also, how many hours does it take to adjust the valves?