While is not an obligation, it is highly recommended to keep the reader`s engagement and shows how serious you are about it. You want your readers to know when you will make an update.
You don`t need to post everyday, but once or twice per week is the common way to go. If you cant upload that frequently because you dont have enough time or you are not fast enough yet,it is okay. You could do it once every two weeks or even once per month in extreme cases. But keep your updates meaningfull. Is frustrating to wait 2 weeks for a person just walking on a hallway.
If you need to go on a hiatus or take a break, make sure to tell your readers and tell them when will you go back.