Edit: Ian Fitz has moved up to forth - good riding from him

Richard - difficult bits: they're making this look very easy, but the next difficult bit will be from after Loch Shin over Bealach Horn to Achfary. There's a nasty climb out of Achfary then lumpy road round the coast to Lockinver. Maybe there for tea time tonight?
The piece immediately after Lochinver is hard - 3 hours (unless you're John Fettis https://www.strava.com/segments/12275747).
The Ullapool Mountain road is OK, bit of hike-a-bike. Things get properly difficult after Ullapool. Coffin Road, Fisherfield, Torridon. There's a bit of respite until Dornie, then you've got the haul over to Glen Affric. Everything is rideable again until the Devil's Staircase (after Kinlochleven).