My college roommate is currently sitting at ~2000 hours as a CFII, and is waiting to hear from the couple of regionals he had CJOs from last year pre-Covid. He was just offered a position flying SIC (with a PIC type rating paid for) in a Citation X as a Part 91 operation with his current company - making around $120,000 total (CFI +Citation) and flying around 350-400 hours per year. He would continue in his role as CFI and be given some administrative duties to comprise the rest of his salary.

His long term career goal is to make it to United, and he's wondering if he needs to turn down this job and wait on the regionals to call, or if he'd set himself up better by taking the jet job. If taking the jet job, how long should he be there before attempting to move on?

Any thoughts or advice?