How long do Compact Fluorescent bulbs last?

[scotts2002]

I am running my compact fluorescent bulbs about 11 to 12 hours a day - depending on the fixture.
How long can they be expected to last, or be effective?

 

[something'sfishy]

IMO, about 9-10 months. I just replaced mine last month :joy:

 

[ronald_j]

I replace mine every 12 months. It's my Christmas present to my fish!!!