People who use altitude tents usually aim to spend 12+ hours a day in the tent, for multiple weeks, to emulate living at altitude. “Long term” exposure is needed to trigger and allow your body to create new red blood cells.
Spending a couple of hours every few days in an altitude chamber will not help.
You could, however, use it to measure how you respond to altitude. I.e. do an FTP test in the room at “altitude”, and compare to FTP at sea level. This would be helpful to know if you plan to do any races at altitude.