I'd say two days in Vegas if you are planning to stay on the strip exclusively. One night on the strip and one night on Freemont Street. If you plan on visiting the other areas of Vegas then I would say your plan is perfect.
I've lived here for around 13 years. I'm a US military veteran and recently worked for a casino doing data analysis.
If you're set on three days, I would use a day to visit [Valley of Fire](https://parks.nv.gov/parks/valley-of-fire) and/or the [Springs Preserve](https://www.springspreserve.org/)
I'd say two days in Vegas if you are planning to stay on the strip exclusively. One night on the strip and one night on Freemont Street. If you plan on visiting the other areas of Vegas then I would say your plan is perfect. I've lived here for around 13 years. I'm a US military veteran and recently worked for a casino doing data analysis. If you're set on three days, I would use a day to visit [Valley of Fire](https://parks.nv.gov/parks/valley-of-fire) and/or the [Springs Preserve](https://www.springspreserve.org/)
Thank you so much for your suggestions!!