I am posting some of the props I made for the Mondi game project. I probably spend 3-6 hours per prop depending on how important the asset was. This includes: Concepting, Approval from the team's AD, High Poly & Low Poly Modeling, Texturing, Additional approval, Implementation into UE4, and testing. My process was: Start in Zbrush or Maya, make the high poly, then the low poly then the UVs and texture in painter with a custom pipeline material.
I had a very modular approach for making the meshes, where I reused bits and pieces to create more assets due to deadlines. For Ex: The vat prop is made from 15 parts, where later used to create the set dressing assets. The stool is set up in a way that we could have fast colour variations.
More About Mondi: https://nickoxart.com/projects/ydmgK?album_id=987937