Payment processes vary by magazine. Some pay automatically, while others will wait for you to generate an invoice on your end. Some pay immediately upon receipt of your final draft, while others have a billing cycle of 30 or even 60 days after print.
The best place to start looking for information on that paycheck is the writer's guidelines on the magazine's website. If you signed a contract, you'll also want to look there for details. If you're still unsure about your moolah after doing your own research, only then is it time to ask your editor.
