Some good advice there, thanks.
Remember that wind, rain, heat, cold and them there hills will be taking it out of you too.
Last weekend we did our first mini tour this year since September last year. And it totally knackered us both for the whole week after. And it was only 110 miles over three days.
Ten miles into the cold wind on a lompy ride will feel like a much longer ride.
We found that we are up and ready to ride around 9:30-10:00, then we ride untill lunch at 13'ish where we normally rest for an hour. Before we do the last bit of our ride which takes us to around 16:00. That give us around the 35miles and plenty of time to stop and look at things, have an ice cream and plain simple faffing around. But that all depends on weather, hills etc.
We have done the 50+ miles in a day but that knackers us too much and don't leave us much time to stop and enjoy the ride. And then take some rest days, cycling every day will just kill you have a rest day every five or so days too eat, wash, check equipment, call home and just chill for a day.
Remember - It's for fun and not a race.