I worked three jobs at once a few years ago. It’s very do-able for the short term if they are the right types of jobs. I worked full-time at one retail job…40 hours. On M-W-F Job One agreed to only schedule me from 12-close, and I worked retail Job 2 from 9-11:45 am, then walked downstairs to Job One. Since I had to work some Saturdays and Sundays, I often had T-Th off, and I was a substitute teacher in the school district I lived in (short commuting time) so I would get called to sub a few times a month. So with three flexible bosses, you can do it.
But back to the OP…between my daughter and my part-time co-workers, I get to see a lot of companies that seem eager to get rid of even good employees, and Denny’s was one. My co-worker got a second job at Denny’s a few months ago, and during her first week she was in a car accident. Her car was pretty mooshed, but driveable after some minor repairs that would take a few days to arrange. She had some minor bruising and was a bit shook up, and with having to deal with the police and insurance stuff, she was late getting to our store (she called and told us). She was supposed to work with us until 9:30 pm, then drive to Denny’s and work there until (I think) about 2 am. She called Denny’s at about 2 pm and told them she’d have a problem getting back and forth from work that evening because of the car, and would really like to switch shifts, but if they couldn’t change her, she’d borrow the money for a cab to get to work and back. They told her, don’t bother coming in unless you bring a police report about the accident. It’s two in the afternoon, the accident was at 11 am three cities over, and she’s at work with no car. The accident report hasn’t even been FILED yet (she called the police to be sure) and she has no way of getting there and back even if she COULD get a copy, but that’s what Denny’s wanted. They wouldn’t reschedule her at all without it, and then told her just to not bother showing up that night at all.
My daughter has gotten jobs at places that have a rule that if you call off sick in the first 30 days, you’re out. One in particular was Chipotle’s. Now remember how bad the flu was this last winter? And remember it’s food service, where you are not supposed to have ill employees working? At least four of her co-workers were showing up with upper respiratory infections, and she got sick too. She became ill at work and got sent home, but had to go to Urgent Care to get a doctor’s note…$70…that she was really ill. And they still said, sorry, you called off in the first 30 days, bye!
Even the one job at a CVS pharmacy, when she was so ill that she threw up on the manager’s shoes, they made her spend $70 to get that doctor’s note. I took it in to her boss, and when the boss said, “OOh, we were so worried about her because she was so sick!” I nearly lost it. I said, “If you knew she was really sick and not faking it, why did you make her spend $70 she doesn’t have to prove it?” They fired her a week later because she wasn’t wearing the right shoes…she had told them she had no money left for new shoes after having to pay for the doctor, and the boss was wearing tennis shoes too, but nope, she’s out.