It will take 5 to 7 day's for roots to start showing. It starts out like little bumps then the roots will sprout.

Are you using any nutrients mix? A low mix about 200 ppm is suggested as well as some B1.
For a 5-gallon mix of RO water with General Hydroponics 3 part mix. I use 12-ml grow 12-ml bloom 12-ml micro for every 5-gallon of water plus 10-ml B1 & 10-ml of calmag plus.

Donâ??t worry about the jell you can reapply it but it will wash off at some point anyway and leave behind a film of nutrients.