Slightly off light timers

I was thinking about running 2 seperate flowering rooms. To make sure that I do not have 2 1000watt lamps running at the same time I was going to set the timers so that each lamp would be on for 11hrs and 45min a day. Is there any problem with running this way verses 12/12?

would be no problem at all..

awesome, thanks! I was guessing they wouldn't notice such a small diference, but I'm new so I thought I should ask.