Circumstances differ of course but it helps to have as few notifications turned on as possible. I don't know how some people manage when their phone or computer is pinging them for just about every random event.
I check it every two hours, on odd numbered hours.
If you text me expecting a response, and you aren't in my priority pool, I'll get back to you. After all, it is my phone, not yours.
My work slack is only available during my work day. Out of hours, it is closed.