I went for 3 years on perpetual harvest... and never missed. I had bugs once and awhile... beat em. Once in awhile an equipment failure.... but not often. Hell I I remodeled and split the room in 2... built a wall right down the middle... and didn't have a problem, other than the signs of stress you'd expect that I was able to grow through.
Then one day I found this big black mite... and nothing worked. I used things that wiped out spider mites in the past, and I couldn't get on top of this thing. I stopped putting in clones and tried to fight on and get as much out as I could. And one day there just wasn't anything left to save, and I tore the whole thing down.
Took 1 month off.
Nuked the room 3 times!! Serious kill bugs dead fumigation.... full on sterilization procedure... hosed the place with bleach and scrubbed.
And carefully put everything back together... got some seeds and some clones to get me going... and fired her back up.
And its one problem after another... Gnats... ballast failures, ac fail, pump fail...etc.
But you know what... just writing this whole thing out made me feel better... cause you know what... those fucking mites aint back