THis is a big issue on a lot of people. Getting 3 hrs is actually a lot compared to me. Most i get out of some people is 2hrs, most 1 - 1.5hr wk.
I end up using Dumbbells as i find it easier to teach with such limited time. Mostly due to Imbalances from left to right and the effect that can have with Barbells.
My progressions start with
1 - Mediballs
2 - Body weights
3 - Dumbbells
4 - Dumbbells circuits
5 - Barbells
Some will be ready to move into Barbells eventually, but, no rush. Like Devils said, It’s not my Job to injure people.