My husband does two-hour strength training and cardio twice a day on the weekends, but remember he's probably in a lot better shape and at a higher level of conditioning than... well, most people on the planet.
I don't think it will hurt, but you need to make sure you have a rest day during the week (he takes mondays off and spends that day eating MORE than usual.. ugh) and he loads up on protein supplements before and after his workouts, which I also don't think you'll need in large quantities for your workout unless you're trying to support a 6'5" body with 24" biceps on a 12 mile ruck march with a 125lb pack.
And yes, I know he's insane.
I would say trying it out and seeing how you feel would be your best bet. Good luck!