Modify: MK 125 dark on, but needs to turns off in 6 hours?

Hi all,
I have read all about this switch, but is there any one that has been able to add to it, to make it switch off at a set time after dark, but still turns on again at dark for the next cycle.
On at dark and off when I want 1hr, 2,3,4,5,6,7. the cycle starts again at sun up. it has to run fully on 12v under battery.
I hope you can help.
Thanks
swany

You can add the VM141 timer
http://www.velleman.be/be/en/product/view/?id=369866

I looked at that but the over all size is getting big, and will use up to mutch power ?

Ok, then I must say then it is running on 12v and will all be on Solar ???

I hope this helps.
Swany