3 weeks flowering....must clone

working on my first grow, going very well actually. due to failure of clones at end of veg period i need to clone my females (seed grown) at 3 weeks flowering. should i put them on 24 hrs light and just try to get the stress over? or 12/12 and wait a bit for 24 hrs? any other tips are welcome.

area is at 70% relative humidity have a dome and seedling mat, first clones didnt have a trimmed spot in the cloning gel (noob).

If you have to take clones take them now and drop them on a 24hr schedule. Still relatively early in the flowering process, so you should be able to pull them out without too much stress.

thanks for fast reply, going to get them done now.