apparently interrupting the dark cycle is more detrimental then having the light on for longer, i would just keep the same sched bc no matter what its not going to take away the fact that you had 2 extra hrs
Interestingly enough i had my 12-12 going from 8a.m.- 8p.m every day but someone bumped the timer so they started coming on and off. My plant has been through quite a bit of stress but after this mess up ir actually started budding bigger and at at more budding sites that were stunted from being transplanted outdoor to in. No explanation for this but its pretty cool hah.
id leave them off for the 2 extra hrs that they stayed on and then shut them off as scheduled and ride it out from there...
for example...if my flowering schedule is ON @6am and OFF@6pm but the light didnt go off @6pm instead off at 8pm then i'd leave the light off the next day till 8am...and shut off at 6pm & from there have them go back to the original ON at 6am and off at 6pm.