I'm a regular consumer of tea (since about 2 years ago), usually from commercial tea bags.

They advise to infuse tea for 3 to 5 minutes, but there is some times that I have left it longer by accident.

So I have been wondering what are the consequences -if any- of infusing tea bag longer than recommended by sellers (sometimes up to 10 minutes). My question is general, but I'm especially interested in black tea.