I currently have a full time job and a weekend job. I work as a Systems Administrator which takes up sometime, especially around the holiday seasons, so work has ramped up at this time. and then on the weekend I work as a maintenance tech for an arcade to help pay off some debts. so as of right now I work on passion projects Thursday nights and thats about it until the holiday season passes and I have more free time. right now lookin at what I have in the roadmap I am primarily working on the NPC interactions (Shop keeper, Inn Keeper, Blacksmith, etc.) I got a foundation for that already programmed in and I have all the photos already generated. so now its just a matter of getting the code loaded onto the passages and adding a button for these interactions. so I am just about done with the next update. I released a new update at the beginning of December, I released the game in start of November.  I would say if my schedule stays the same I can probably get a new update out every 3 weeks to 1 1/2 months. so on average once a month.

tl;dr - once a month