Most cheaper keyboards are expected to last a minimum of 5 million keystrokes and clicks on each key.
That's a lot of typing and it would probably take you 5 years to reach 5 million keystrokes on the keyboard and that's about as long as I can get a keyboard to last.
Now I don't know whether I typed 5 million keystrokes during those 5 years with the keyboard but I probably did or at least typed close to that since I do a lot of typing on my computer and keyboard.
Some higher priced keyboards are estimated to last up to 10 million keystrokes and that would also be a lot of typing to reach that amount.