It is more than unsusual, its unheard of
Most clubs, rental company's etc want to see minimum of 30hr/mnth. To be honest, i think its more likely that 40 will be asked for and 30 agreed, but only after a lot of bartering!
I would suggest you try getting a deal out of your local flying school. Some zero capital groups might also welcome you if you want to do your hour building during the week! Trouble is cheap flying comes at a cost!
Cheers PB.