It depends on the scenes, some scenes take 10 minutes, some take 3 hours. Most of the indoor scenes need at least an hour to finish (usually longer). If I'm lucky and find a HDRi (that's basically just a 360° background image with light information in it) that fits an outdoor scene and there aren't many people in the scene it will take 10 to 20 minutes, but that's very few scenes so far :/
I have a 2080Ti at the moment and since I'm using iray (which is a biased render engine made by nvidia) to render the images, I need an nvidia grafics card, which is also what determines the rendering speed.
I had another card previously which I used in combination with the current card, but it died, so I'm roughly at half the rendering speed I used to have.
It was the third card that died on me since I make these type of renders btw :/