How much is the manga's royalties per grid? Is it calculated by grid or per chapter? How often is the royalties paid? Once a month or every update?

I can't provide any specific information about the royalties because I don't have access to the comic. But generally speaking, manga royalties were calculated based on the price per frame (or per page). Different comics and regions may vary, so it is recommended that you check the relevant websites or consult the customer service staff of the comic company to obtain more accurate information. Usually, after the release of the comic, the author would receive a payment for each update. Therefore, you need to pay attention to the update frequency of the manga in order to obtain the information on the royalties in time. Normally, Quick Look Manga will release the payment settlement information on the morning or evening of each update day. You can check the detailed income situation on the website.