About how much time is usually spent here per visit?

I also spent around 1.5 hr

Since it's towards the end of the season a lot of the sunflowers have already died or there would be a much bigger field and if you were to want to experience that you need to come earlier in the month. But for what is left which is still a lot to choose from and very beautiful I would have to agree with everyone else about an hour and a half to two hours. It's a very unique beautiful experience.. there are lots of bees so if you're allergic I do suggest you bring your EpiPen although I did not need to use mine at all they are much more attracted to the beautiful sunflowers than they are us... Enjoy your time and don't forget they have the corn maze and pumpkin patch coming up for the fall I plan to attend that as well the people that work there are very knowledgeable kind down to earth people you'll have a great time...

I spent around an hour and a half. Just depends on how much you want to walk. 🙂