I don't remember when exactly I got 1k subs, but on my 9th update I posted a "Thank you for 2.3k subs!", so based on that information... It took about 8 updates over the course of 4 months to get 2.3k
From the first episode, I think there a few comments saying the art drew them in. Also my comic is in the drama section, so that probably helped? Some people said it would do even better if it was in the Romance section, but I don't feel that genre really suited my comic.