I think it's up to you how many times you update your comic.
My comic consist of one-page stories as well, so I usually post whenever I have created a new one, although I have a personal rule not to post more than once a day (with exception).
But it doesn't really matter how many times you post as long as you don't post too much in a short time or too little in a long time. The first will scare readers because having to read too many pages at once is scary. The latter will make them think that you're either on a hiatus or have quit entirely.
I suppose it's best to notify your readers on the amount of times you plan to post daily/weekly/monthly/yearly, or reveal the date for the next page release. That way they'll know what to expect.