With my Santa Cruz Superlight, it’s needed a new shock bush (£5 and 10 minutes) about every 9 months and I’m expecting the main pivot bearing to last a couple of years (20 months so far).
The Stumpjumper FSR was a LOT more than that though. Shock bushes every couple of rides and new bearings about every couple of months. There was something wrong with that though.
I spend maybe half an hour setting up the shock properly, riding round, adjusting, riding round again etc. The I just leave it and check the sag every few rides. Doesn’t take any more time though. Maybe get the shock serviced every 12-18 months. About £80 for a service.
FS bikes take a bit longer to wash as well, more nooks and crannies to hold mud.