Yep, you can double up if you want and do two shorter workouts one after the other or just remove a workout and add a longer one in its place. What I would do though is replace like for like ie: high intensity days stay high intensity just a bit longer and easier days remain easier days, albeit a bit longer and rest days remain rest days
One option if the base workout is a high intensity workout is to do that and then add an endurance or lower intensity workout until you get to the length you want. I’ve done that to good effect. I have (rarely) done two high intensity workouts back to back. That has not usually been to good effect and generally takes me too long to fully recover.