Yes it starts off like a white mould. A couple more weeks and it becomes more jelly like. Mines at that stage now but quite thin. Don't know how long to leave it. May make some more green tea and sugar solution and transfer it to that see if it grows some more. This is my first time so I'm not too sure what to do next myself. That's why I did this post in case anyone else had done it and knew what to do. Total experiment in my case.
I’m just on my third batch and only now has my scoby started to look like it’s growing, but the first brew was after ten days in a room ticking over at about 15 -18c. I use a gallon Kilner jar with a tap and put all but an inch of the initial brew into bottles, each with half a teaspoon of sugar and a couple of slices of ginger, leaving it for a week and it was excellent.
I then topped up the remaining brew with fresh tea and sugar and it worked much more enthusiastically the second time. I bottled that yesterday and started my third brew.
If yours has gone for ten days or so, I’d say get it bottled, top up the leftovers and see what the bottled stuff is like next week.