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For me it was right at 80 hours of practice, which was about 5 months in. I felt like I could consistently make chords, play a few songs, my strumming still sucked. Strumming fell into place at around 120 hours. That being said, everyone is different and it really depends on how you approach practice. I have a very strict practice routine that varies for each day of the week, each routine is timed (3-5 mins), and I use a metronome religiously. When I don’t do that level of “focused” practice it takes much longer.
When I have a problem with a chord I will include focus time on just that chord into my routine, 3 mins of slow motion placing my fingers without strumming, 3 mins of alternating which finger goes down first without strumming, 3 mins of picking each string and doing micro-adjustments so each string rings clear. It took a week of doing this everyday to get the Dm chord and 5 weeks of doing this everyday for the C chord. For strumming I do 3 mins of a given pattern with the strings muted. This may be overboard for most, but it is what it takes for me to feel like I’m improving and it works for me.