I like to space out my listings, with a maximum of 2 per day. When I was launching a new product last month, I did two or three a day consistently for about a week to build up my stock, but have now slowed to a steadier pace (one every other day or so).
For those of you who don't have time, leading you to binge post, you could always do all of your listings in one go when you're free, and save them as drafts. That way, you could still list one each day (or however often you want). It takes just a few clicks to publish a draft listing, and it's even more convenient if you have the Sell on Etsy app!