When to use “around” and “about”?

Question

As I know about and around can be used when we estimate something, for example,

I'll arrived around 3:00 PM.

or

I'm here about 10 minutes.

I want to know, are there any rules or idioms when to use about or around?

I’m not sure what you mean by your examples. The first one seems strictly ungrammatical (maybe you mean “I’ll arrive”) and the second needs an “only” or “just” to make sense, or maybe should be in the future tense.
I'm not good as gramma but I want to know can I use about in first example and around in second?
@nohat: the second example does make sense, if you imagine the person speaking is in a rush.

RegDwighт · Accepted Answer · 2012-05-02 19:06:54Z

When used to indicate an approximate time (your first example), "around" is more common.

When used to indicate an approximate duration, either will do, but "about" is probably more common. No particular difference in register, though.

I'm guessing that your first example should be "I'll arrive around 3 pm" while your second should be "I've been here [for] about/around ten minutes".

(British usage)

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