OK, this is probably the usage it will get:
Ragging in woods on singletrack, drops and jumps (2 – 3 hr blasts) – Once a week
DH Days (Inners/Alps) – 2 – 3 weekends a year
Trail centres – 5 weekend trips a year
30 mile XC trips – 1 – 2 times a month?!
Urban blasts (2hrs) – Once a week
Dual/4x – Once a month
Family riding on tow paths etc – Handful of times in the summer