Why do people take so long to reply?

Most of us have our phones right there. I reply back ASAP just as I would answer a phone call. It takes 10 seconds on average I’d say. Even if I’m juggling multiple potential dates. It feels like I’m emailing people and maybe I’ll receive a response by COB.

Go ahead with the downvotes, but just curious. It’s not rude, people should communicate how they want, so no judgement on people who do take a long time to reply back