How often or long would you kiss your girlfriend/boyfriend for?

I recently got a boyfriend and we both had our first kiss on the 6th date. But on that day we kissed three times and since then we kissed a few times when we meet up. But he noticed that after the second kiss my hand was shaking and another time I was shaking too as he had his hand on my waist. Do you think this is strange?
He mentioned to me a couple of times that I tasted minty, as I did take mints and brushed my teeth but I didn't feel any taste from me so it's making me self conscious. He did say I didn't breathe into his mouth when I was kissing him so I don't understand how people taste the kiss? I also find it hard to breathe at all when I kiss him. But I don't notice that I need air and he breaks away so I do breathe then.
Also what types of kisses do you do and how often and how long do they last?

Thank you for reading.
How often or long would you kiss your girlfriend/boyfriend for?
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