Impossible to say. It could be immediate, or a year.

If those bases are important to you, I'd really consider the Brasilia. You'll get those bases much quicker, and will have a better QOL sooner by getting off reserve.

Even though I was typed and flying a jet before SkyWest, I took the Brasilia for better seniority (it was the earliest class I could take). I never regretted it... It was fun to fly, the destinations (west coast) are fun, and I was only on reserve a couple of months. By the time I transitioned to the CRJ, I was able to hold a line in all but the most senior bases.