I have only ever made yoghurt once before...it was only ok.
This time I used the method from SuperKitchenMachine and my Aldi Yoghurt maker (basically keeps it warm).
The only problem is that I made the yoghurt last night at about 8-9pm, put it in the yoghurt maker, went to bed, got up, went to work and I just came home (2.30pm) to find the yoghurt still in the yoghurt maker.
It looks like it has set really well but, do you think it is still ok to use?