How consistent do you have to be, in uploading your chapters once you've been contracted?
Contract
Contracted? None.
When you go premium ie locking your chapter? Well, the contract itself does not impose any particular limit or requirement. It does, however, recommend daily updates, twice a day - based on the more you do, the more it captures and maintains readers' interest.
Aside from that, you have the MGS that again, is not compulsory. If you do want it, you need to upload daily, with 1500 words minimum. For a month. No missing a day. MGS is only for four months.
Note that once you go premium, you are automatically activating privilege as well. WN imposes it whereby you have 2 chapters of privilege. Note that if you do not have a stockpile of 2 extra chapters, when you go premium, any uploads of chapters would go into privilege first. None will be released until you upload 3 chapters.
That makes sense, but what do you mean daily for a month? Is it limited to only one month or as long as you update consistently every week, it should be ok?