I only get to ride twice during the week and then usually on Saturday mornings. On one of the weekday rides, I push hard (for me) - ~20-30 miles at ~20mph. This is on a flat 1 mile loop. I also mix in some intervals. With riding on Tuesday/Thursday or Monday/Wednesday, do I really need a 'slow' ride. I am more comfortable on the bike going 18+mph than going 15mph, but when I do decide I am going to have a nice easy ride, within 5-10miles I find myself pushing myself to beat my average speed of ~20.5mph. Longer rides during the week aren't really an option as after riding the 1 mile loop 20-25 times I want to off myself...I do longer rides (60-70miles) on my Saturday rides and push hard, but being in Texas (heat and humidity) I pull the effort back a little...