How long can you go between flushes

how long can you go between flushes and still count them as successive?

example- if you do 5 flushes, each one 2 or 3 weeks apart and then skip for about 6 months or maybe even a year, would the next flush be considered number 6? or do you start counting over again?

add this to the dumb question file, but i'm curious how everyone is counting their flushes. Tweet