Career consultant here (midlifecareerstrategy.com) Don't over-think this. If you're used to a loose schedule, it can feel daunting to return to a p/t job...but once you're in the groove you get back, and you're happier. When I went back to grad school I worried that I wouldn't be able to study and take tests. A friend worried about moving to a demanding job after 2 years of coasting. Human beings need a challenge. Give the job at least 90 days - preferably 6 months.