Timer failed during 12/12

Hi,
just came home and was surprised that there is still light in the grow room - timer failed and my girls got 20 hours of light while in the 5th week of flowering.
Should I just turn on the light as normal - they will only get 4 hours of darkness in this particular day or should I move the whole cycle? Will it influence flowering to some serious extent? Thanks

If it happens once or twice during flowering I wouldn't worry about it, but if it keeps happening you are in danger of getting hermies or having your whole crop revert back to veg (messy).

Just get them back on their regular schedule as soon as possible. This is certainly not a disaster.

yeah just give them the 4 hours of darkness and get back on track , no biggie