It is advisable to check the water of a hot tub daily to ensure the water chemistry is balanced. It’s not good for the hot tub or its users if it’s not. Be mindful that this is a job you should continue to do even if the hot tub isn’t being used.
Test strips like these at Walmart make the job easy, so it’s not an onerous task, and you can follow the manufacturer’s advice to decide if you need to add chemicals to correct levels.