Sorry, the purist in me just cringes at this way of making marscapone
If you are making marscapone with a tartaric acid mix, you need to line a colander with a double layer of butter muslin and ladle the curds gently into the colander and drain it for an hour.
If making it the traditional way with a culture you need to let it set undisturbed at room temp for 12 hours until thickened and then do the colander bit for up to 4 hours.
*Paraphrased from Home cheesemaking by Rickki Carrol, pages 72, 73.