How many hours does it take to change timing chains

it has>>> 3 chains, crank sprocket, 4 guides, 2 idler sprockets, 2 tensioner arms, 3 tensioners.depending on your skill level,7-11 hours.if you don't have a clue,could take 2 days?

Don't take but a second to "change" them but takes a pretty good while to REPLACE them!!