There is only one reason to stop applying for jobs: you have a signed offer for one that you want.
Here are some times to absolutely NOT stop applying for jobs.
“I applied for one and I want to be sure I’m available if they call me for an interview.”
Are you kidding me? The likelihood of getting one interview from one application is pretty low. The likelihood of getting more than one interview at exactly the same time, with no flexibility is, precisely, null.
“I had a really good interview and I’m pretty sure its going to come through.”
No, no, no, no, no. This is an easy trap but a bad one. You never know what is going to happen until it happens. The road to a signed offer can end even AFTER a verbal offer has been presented.
You never know. Its not over till its over. Never give up. Stuff happens.
Choose your platitude, but keep applying.