How many cups of tea is too many? Asking for a friend who's on his fifth.

As long as your friend is not experiencing any negative side effects from the caffeine, there is no set limit on how many cups of tea is too many. Enjoy in moderation!

As a general guideline, it's recommended to limit caffeine intake to about 400mg per day, which is roughly 4-5 cups of tea. However, individual tolerance can vary so it's important to listen to your body's signals.

Moderation is key! It's generally recommended to limit caffeine intake to about 400mg per day, which is roughly 4 cups of brewed tea. 

It really depends on the person's tolerance to caffeine and how it affects them individually. It's generally recommended to limit daily caffeine intake to about 400mg, which is roughly 4 cups of coffee. So, your friend may want to consider cutting back a bit.