There is no usual time. We just post them whenever we're hiring.
I'm not sure what you mean by usual job requests. You may try this discord channel if you're looking for a visual novel related job:
https://discord.gg/devtalk
Happy New Years and a prosper 2025. Thx for the discord link, there were like an enormous amount of job opportunities but the voice acting and proofreader jobs are gone, I am not confident in my animation skills although I major in computer, electronic and electrical engineering, the latter is something I am still improving unfortunately, are there that little animators in the market TvT.