Most state legislatures work under a similar model -- being a legislator is full time work for a couple months of the year, and the rest of the time, delegates/senators are expected to have other jobs. (This is "enforced" by legislator pay being something like ~$10K/year.)

It's not a perfect system. There are very few jobs that just let you take off a couple of months a year, so legislators tend to have specific careers. Constituent services are required year-round, so legislative staff are full-time, year-round employees. And legislating has to happen quickly, so it's harder for citizens to interact and follow along with the process when they want to advocate for a bill.