Mine have been on vermiculite for ~1 month, also on a heat pad, watered almost daily
Richard claims they have a long germination time (hence the GA3 soak)- other Annonas I have grown seem to have a reliable "timer" where there will be no germination for months and then all the sudden you have 100% germination.
Richard also claims they are great for container growing-
Fingers crossed some sprouts come