And don't forget, out of those 2500 with 'usable' Talent, not all of those are going to be capable of working a corporate lifestyle. Those with the Talent tend to be a bit eccentric at times. So of that 2500, you may have just 2000 who can hack it in corporate life, while the others fall into the shadows, become gangers, work to protect their neighborhood, go off to live in the wilderness, become toxics, turn to insect totems, and so on. And that 2500 also includes talismongers as well.
But MijRai is right. Shadowrun is a Dystopian setting. Labor laws have pretty much gone the way of the dodo, and unions are nonexistent. People are locked into contracts they can't get out of, and brainwashed to the point that they don't want to leave. They are told that, if they fall below their goals, they'll be sent out of the safety of corporate life, into the terrible lands outside. So they work 70 hours a week, and don't complain too much, because that's the price you pay for safety.
High value employees, like your top-line researchers or high-power mages, have better conditions, get more leeway, but are locked in even tighter, always have guards 'for their safety', and are still required to work long hours, because if they aren't working what their subordinates are, then someone from management may decide they aren't worth the money any more. Until you get to the very top, that's the way it is. And even at the top, you're not exactly sitting back, eating caviar and sipping champagne through the work day. Sure, you're not slaving away on an assembly line, but do you know how much work a Damien Knight or Lofwyr has to put in to keep their corporate empire running?
If you want shorter work days (with the increased risk of sudden lead poisoning), you drop out of the corporate world, and enter the shadows.