Travel / How quickly does the sun set in Poland? [12]

I once heard that sunsets in Poland last for a very long time (more than an hour), but my friend just told me that they're actually quite quick -- she says the sun has usually finished setting in less than half an hour.

How long do they usually take? Does it depend very much on the time of year, or part of the country?

The thing is, my Dad was Polish, but he died when I was 4. I've never had the chance to go to Poland yet (although I'm desperate to), and I love sunsets and would love to know what they're like in Poland.

I thought I was going to be able to go to Warsaw last April, but then I couldn't. I'd love to know what the sunsets are like there at that time of year, because my Dad was from Warsaw and was born in April.

Thanks for your time.

EDIT - I meant to put this in Society, Culture! Sorry!!