wouldn't worry dude, i've had a timer go on me and its given 24 hrs of light for several days while the plant is in flower, reverted back to flower cycle no problem, just needed a bit more time in flower than normal before it was ready to crop. My mate has accidently done this sort of thing on numerous occasions, worse one resulted in veg shoots coming out of the buds, he reverted to 6hrs light and still had a good crop, just took a little longer. The time your cycle was disturbed i wouldn't think would have much if any noticable effect. i'd agree with everyone else on the mite issue, use neem. natural makes for a smoother smoke!! i've been lucky not to suffer mites for years, but i have loads of strips just in case, and disinfect my grow room between grows. kills any mould spores at the same time, happy new year dude.