Thank you for your comment – I’m so glad to hear that the article was helpful for you! Generally we suggest trying for about an hour before giving up, but it can depend on the baby’s age and personality. We do have an article all about nap training that may help you here, as well: https://www.babysleepsite.com/baby-naps-2/nap-training-how-and-when/
"No Tears" Techniques: Just as some parents and experts believe that it is harmless to allow an older baby to cry for set periods of time, others prefer sleep-training methods that gradually teach the baby to fall asleep without Mom or Dad’s help. For example, one "no tears" method involves sitting in a chair next to the crib while the baby falls asleep, and then, each night, moving the chair farther from the crib until it's in the doorway—and then, finally, outside the room.
There’s also no need to institute a regimented cry-it-out plan if what you’re currently doing is working for your family. But good sleep habits never hurt, and being able to fall asleep on one’s own is a necessary life skill. If you sleep-train at a time that’s developmentally appropriate for your baby and with the basic ingredients of healthy sleep in place, you can minimize the amount of crying your baby (and, let’s face it, you) will do.