The seniority map on the SkyWest Careers page will tell you the hire date of the most junior captain and FO in each base. Your time on reserve will depend on how many FOs senior to you upgrade in your base, how many DECs are hired after you, and how fast the captains senior to you leave for greener pastures; too many variables to guess but it could be years.

https://www.skywest.com/skywest-airline-jobs/career-guides/pilot-jobs?utm_source=HR_FO&utm_medium=APC&utm_campaign= ProfilePage