7 hours or so to do depend how handy you are and what tools you have ie a 4 post lift helps.
New clutch is only cheap at Renault change the cable for a proper Renault one at the same time.
I know a local garage which would do it for a good price but its 65 miles from you and they don't do coutesy cars
Will take ALOT longer than 7 hours, esp if he hasn't done it before, it took me 2 days first time i did it, most of it was spent removing things i eneded up not having to remove atall, and putting them back lol
Hardest part is lifting the box back up and getting it back on, esp if you are doing it on your own, the wires all get in the way lol