Take pity on this poor newbie!

Hi Guys,
I'm very, very new to this and any help/advice anyone could give at any point is very welcome.
I am attempting to grow four bubblegum plants in a large-ish cupboard in my house. I've lined it with white refective sheeting and have a 250w hanging light system. Spent three days germinating my seeds and yesterday afternoon they were peeking, so transplanted to starter net pots, watered in with ph tested water and recommended nutrient mix and placed them about 10" under light. I'm using the ol' 18/6 light/dark method and am using the pot-ponics method, so my babies currently live in canna coco.
They have now been potted and under light/dark for about 36 hours and I can't see any shoots yet. At the risk of sounding like a fool; how long is it supposed to take? Have I gone wrong somewhere?
First person to reply gets a virtual cookie!!!
Thank you.
NB:Anything I've done right is all down to Widow Maker and his indispensible guides, anything I've done wrong is all down to me!

It can take anywhere from a day up to 10 days before you see them.

Where did you get your White reflective sheeting?

Thank you so much!
Last time I tried growing anything it was a sunflower and I was five, so I was getting a little antsy. Feel much better now!
Have a virtual cookie!

4m of reflective sheeting came with a PotPonics kit I bought from a hydroponics centre (it also had the lights, pots, nutrient mixes, canna coco, ph testing stuff) for about £120. Good deal, huh?!

If you have been following Widows advice you will be fine. Good growing.