So about 6 months-1 year ago it was around 22-24 months. Over the summer because of such low amounts of FOs, upgrading was frozen and no one upgraded for like 1-3 months (can't remember exact time frame). Upgrading has resumed, but is now more like 3ish years. With 3 bases closing, you can expect upgrade times to probably decrease slightly (because a lot of pilots also left, and ORD/DEN received more flying so losing all the flying in those 3 bases sort of offset the additional pilots somewhat).