You've forgotten the option of riding back...
No, I ignored it, riding back is the work of Stan.
As a general rule of thumb, what sort of times are we looking to be at at various points of the ride. I am not particularly fit and this will be my longest ride. (33 miles is the most with no bother) but I am a regular commuter. I have been looking at the routemap and been trying to work out what is a reasonable time to reach say, Mitcham, then the top of Reigate Hill, then the bottom (whoa there!); then Horley and the rest stop. Turners Hill summit, Lindfield, Wivelsfield Green and the Beacon. Any thoughts. I appreciate that it's not a race and I will certainly be taking it easy and enjoying the ride and chatting away to whoever will listen
. But I'd just like a bit of an idea.
I wouldn't like to suggest an exact time, but given that, as StuAff says, we'll probably arrive 7-30 to 8ish, that's less than 10 mph average speed. In practice of course we'll spend an hour or so with the mid-way refreshments, and it always takes longer to get out of London, because of the much busier traffic, and large number of junctions (with traffic lights). I'm not saying that there will be too much traffic in London, but there will be some, compared to many parts of the rest of the ride, where you may not see a car for half an hour! (although London to Brighton is probably busier in places than some of the other rides).
I'd suspect that if you work on the basis of 10mph, and maybe half an hour longer on the first stretch (ie 10 miles in 1½ hours) and an hours stop in the middle, then you wouldn't be too far off on estimates of time.
There will likely be some variation in this, especially if we leave late, or have some problematic mechanical, or Simon has to divert the ride for some reason (we have very occasionally had to divert around unexpected road closures), or the midway stop causes unusual delays, or 101 other potential reasons.
(Edited to deal with some typos, and to add a little extra bit in)