How soon is too soon to start casually dating

As long as you’re comfortable with it I don’t see a problem at all.

Whenever you’re ready to there’s no time limit

Whenever you feel comfortable. Make sure you give yourself time to heal & don’t rush into anything

I think this really depends on the situation. If the divorce is traumatic or emotions are very high, you may want to give yourself more time to feel ready and "unload your baggage" so to speak vs if the 2 of you have been parting ways emotionally for quite awhile, it's amicable etc. My brother has been with his girlfriend 1.5 years, she hadn't even filed for divorce yet, but she and her now-ex-husband had been parting ways for quite some time and had been separated already, and he was with someone else as well. In other words, there's really no right or wrong answer, it really depends on where you're at emotionally.

I say whenever you feel ready is the appropriate time. People are going to have their opinions no matter what you do, so just move on when you are ready.