As for the FBM ground time being 1h 15 minutes, just remember, its Congo :-)
In all seriousness, the SAX FBM ground crew is usually pretty efficient. Many many times I've seen the Q400 that presently does the route or the CR2 that used to do it leave 5-10 minutes early. But with DRC, its always good to build in some wiggle room, because you never know what kind of b.s. will crop up.
JT