How fast can flys fly?

Day 2 - Altnaharra to Beauly
Whew. Maybe I'm not such an old crock as I thought, my knee staged a marvellous recovery in time for a 9am departure - deep joy.
So good was it that it coped with an 8 mile steady climb up to the Crask Inn. Thank goodness they were full else we'd have been faced with climb last night - no chance.
Quote from Martin to our B&B hosts last night: so theses German and Dutch visitors, where do they come from then?
On the way down past Lairg to Bonar Bridge stopped off for a chat with Pete who has a team of Siberian Husky's for sled racing. Very nice bloke.
Next stop was Shin Falls to watch the Salmon leaping, quite a sight. Chatted to Betty who was trying to spot one and asked whether they would be leaping up or down the river. DUH! The site is owned by Mohammed Al Fayed so there's this ludicrous sight of coachloads of tourists sightseeing the Highlands buying tins of Harrods biscuits and teddy bears. Lord help us.
Met a few LEJOGers (i.e. Heading North) especially Chris - hope your knee held out mate.
Took a great shortcut to avoid the A9 and save 12 miles, the only payback was a 2 mile 1 in 3 hill which we were proud to pedal all the way. Met a father and son from Derby doing JOGLE on a pre-war tandem which the dad used to have his son in a babyseat on the back of. James thought was very sentimental and sweet. Plain stupid I call it (weighs a ton and only has three gears).
14 miles from the end we needed a break so had an injection of iron (from Dublin served extra cold). On reflecion this wasn't so clever as the last hour was a real effort.
I think my body is only conditioned for 50 odd miles as the last hour or so on both days so far has been a real struggle.
Priory Hotel in Beauly is highly recommended. Great plate of complex carbs (pasta carbonara) just what the doctor ordered, and a dram of Glen Ord from the local distillery. How many pubs do you know that when the local taxi driver is busy have a barmaid who drives you home herself? Stephanie you're a star.
Don't think I mentioned that we're sampling the local whisky at each stopover. Glen Ord quite average (says the connoiseur)but think tomorrows Dalwhinnie is supposed to be pretty good.
So does anyone know how fast a fly can fly? At the shin falls a swarm of them attached themselves to my head presumably because I smelt like a tramp by this stage. Then they proceeded to buzz around me down the hill at 20mph - darned clever if more than a little irritating. Only when we hit our top speed of 35.9mph did I shake them off. I guess the answer is therefore between 20-35.9mph. Fast buggers aren't they.
Lou Reed you were a day too early - this was pretty close to a Perfect Day: fantastic scenery, no rain, bit of sun and what little wind there was came from oop north to push us along. Cheers to The Almighty dude or whoever dictates these things. Any chance of more ofthe same tomorrow?