I was around SQ (as an F/O) in the 742/743 days, when we would alternate between pax & freight.
Invariably, the freighters always recieved No 2 priority in respect to just about everything - departure times, refuelling, maintenance, etc.
Delays - sorry, rescheduling - was often done in 24 hour blocks.
But it was enjoyable - no late pax, no no-shows, no need to worry about how the attire looked going back - many of the locals used to wear track suits.
All in all, the operation was much more "relaxed", imo, as the turnaround times were usually fairly generous.
As someone else commented, the catering was usually better than the pax flights...the lobster out of Brussells, the biryani rice ex Dubai.
I have heard that now that SQ runs a dedicated freighter company, the guys are away for VERY long stretches, which isn't conducive to a good family life, but more suited to single pilots (or those looking at re-achieving single status!).