If only 3-4 hours I would look to get something much much larger. If you haven't already gotten your Linnie, I would wait until you can get a cage like this: Kings Cages SLF 2818 Flight Cage 28X18X56 or bigger.at least 3-4 hours if not more i spend almost all my time in my room
You can look for some big cages on places like facebook marketplace ect. But just make sure to clean it properly with bird safe cleaners.