I recanvass every 3 months as an average, nomatter how often i canvass an area the results tend to all be the same.
So you knock on the same doors every 3 months even if they said no last time?
Yes, i dont tend to waste time knocking on clean houses(whats the point).
Proof is in the pudding how i get results, husband answers first time i knock and says no he will do them himself, 3 months later i see they are still dirty so i knock again and wife answers and says yes my husband has been saying for ages he will do them but never does etc etc.
Circumstances always change people move, people sack there wc, people lose there job and have to lose the wc and vise versa i could knock as customer gets another job and wants a wc. The possibilities are endless so there is no problem at all doing it every 3 months.