It really is up to you. As far as comm rules go, you would be absolutely okay to do post each icon individually if you wanted; ditto the other extreme of posting the whole 100 together when done - and therefore anything in between is also fine, so you can work out what suits you best and helps keep you motivated.
3+ icons seem perfectly reasonable for a batch to me, so just post as you wish - 3 or 5 or 10 or 20 or 25, or just monthly updates, as you said. They can also be as irregular as you want as well - if you just want to post out loud (as it were) when you've had a burst of inspiration, no need to wait on a schedule or anything. Equally, if you work best with a schedule and set numbers to aim for, you can set yourself that and work to it.
That most unhelpful of answers, sorry - it's very much up to you. <3
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3+ icons seem perfectly reasonable for a batch to me, so just post as you wish - 3 or 5 or 10 or 20 or 25, or just monthly updates, as you said. They can also be as irregular as you want as well - if you just want to post out loud (as it were) when you've had a burst of inspiration, no need to wait on a schedule or anything. Equally, if you work best with a schedule and set numbers to aim for, you can set yourself that and work to it.
That most unhelpful of answers, sorry - it's very much up to you. <3