Well, mine was done yesterday at the dealers. A job listed for around 4hrs took almost a complete day due to the faff of taking stuff apart and putting it together again. Apparently it turned out to be trickier than they had allowed for.
Fortunately I have All In package so a job quoted at £950 cost me nothing.
If the labour cost had been “open ended”, I suspect the entire job would have been more than £950.