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If I file form 2210 asking for abatement of penalty, how does this work.

 

Would IRS send you a letter either approving or disapproving it

 

certainly if disapproves because you'll be getting a bill or smaller refund. not sure what it does if approved. you'll know because you should get your full refund unless there are other issues but then you would also get a letter or notice 

 

or either you get refund check or no news?

How long does it takes to get refund for under payment penalty?

 

no waiver requested - on average the irs says 21 days but it can be more or less. for waiver that would need to be reviewed by an agent/supervisor for approval. so how long that might take is unknown