> If I can receive a message, respond to it four hours or a day later, and receive a phone call for anything more urgent than that, I'm happy to use IM platform

> If I can receive a message, respond to it four hours or a day later, and receive a phone call for anything more urgent than that, I'm happy to use IM platforms for collaboration. Isn't that exactly Slack with the "Do not disturb" mode on does or email?