What is the expected lifetime of a string? Hi all,

How long should I expect my strings to last? I ask because my strings broke again tonight - this is the third time I'll have to get it restrung since last May. 

Last May I got BG80 string at 23lbs, that lasted until November. I got the same in November it has broken tonight. I'm surprised because  that seems very short to me, especially at that tension - I only play 2 hours a week so probably no more than 24 hours club play since November.

Is it poor technique contributing to this? And / or is there a different type of string recommended - maybe I'm choosing poorly?