I never use this feature. I've never wanted it. When I want my email, I just go get it. That's for personal use.
For work, I'd want to see each email as soon as possible. That way I never get behind.
Handle one email, send/receive, handle those new emails, etc. Again, the check mail feature isn't useful to me.
And if I'm expecting an important email, I just check it more often.
Really, I don't see the point unless you want notifications, which I find very distracting & annoying.
If, on the rare occasion my sister in New York invites me to skype with her, she sends me a text message.
If I thought she might send me an email to invite me to video chat, I'd go crazy sitting there hitting refresh every 5 seconds.
That could be all the time. I don't know how you manage like that, CleverCat!