Cuttings and clay pebbles

I have 12 cuttings in a root riot block i have planted in my iws system with strictly pebbles. Can anyone tell me how many times a day i should feed in order to get the roots to grow out of the netted pots? Thankyou

Should i handfeed for the first week?

I would research cloning solutions. I have good results with "Clonex" it help with root growth, and gives your plant a light feeding. You use it every watering for the first 7-14 days. By then the roots should be nice, and she should be ready fir her first real feeding. You can use a light feeding of what ever nutes you have also. I usually would look at the feeding schedule for seedlings and cut it in half and feed like that fir the first week or two.

I'm not sure what is iws sytem, it sounds like a DWC, the best way to grow roots quickly is to make a flood and drain, raise and lower water level to keep the netpot moist and aerated, do it as much as your timer allows if possible every 1/2 hour. if you cant do that another way is to keep water level just touching the bottom of the growrocks in netpot. you may need to handfeed depending on size of netpots, the more you keep the growrocks moist but not submerged, the faster root growth. you also need to give them ferts in the right amounts and aerate your res well