How long to develop feelings/open up?

How long does it take you develop feelings for your boy/girlfriend? I met the guy I've been seeing on a dating app and didn't have any expectations initially. We've gone on lots of dates, usually last half day or more, and we've have PDA/kissed/sex-all of which have been great. Over about a month and a half I've started developing feelings for him. In the first few weeks, he asked if I was interested in him b/c I guess I was a little closed off. I haven't really dated, so I'm trying to avoid over/under sharing, but he's expressed interest in really getting to know me. Is 1.5 months normal to realize you genuinely like someone and any tips on how to show him my growing feelings?
How long to develop feelings/open up?
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