I would aim for once a week and then work you way up to twice a week if need. regular ph'd water between feeds. Given that this is soil it will hold onto nutrients you put in there and will not flush out like a hydro setup if you over feed them, So less is more in the end.
plus flushing soil is detrimental to the medium. It holds onto too much water and can cause root rot and other issues like gnats.
Good Luck!
***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details:
growdiaries.com/giveaways/GotM-August-2022
Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***