is a metric century realistic?

[Duck on Wheels]

If you're doing 40 miles on your own, then you should be good for at least a metric century on a supported ride. I do 20 on my own, but have done 40 on a supported ride and barely noticed it the next day. It really does feel easier once there are others riding alongside and a rest stop to look forward to just when you're beginning to feel you need it. Just remember the antibonk rule: Drink before you're thirsty; eat before you're hungry! So carry plenty of water and some sports drink, drink a couple of good mouthsfull every 10 minutes (or sip pretty much constantly if you're wearing a camelbak). [I had water in my camelbak and energy drink in my caged bottle; sipped water constantly, and took a slug from the bottle every half hour or so.] Also carry a couple of your favorite energy bars, and be sure to eat at least some of the fruit and cookies on offer plus refill your drink bottles at every rest stop. Oh ... and HAVE FUN