split decsion here
weekday - hours - I'm really pressed for time and it makes it easier -usually about an hour
weekend- miles- but It usually does come to hours -60 or so on Saturday, and around 30 on Sundays
I can rememebr back when I started reading a Gref le Mond book , an he recommend traing by time instead of miles, reason being that as you got better, if went by miles, your training time would decrease.