Saying the words 'how long', we are asking the time period. Before time began, there was no time, and thus, even if it only started 100 million years ago, then that would be, say, forever, as before that time period, that was no time. So before time began, and there was no time, then there was nothing to calculate or even literally, the length of time that existed. Time, then, has been around forever, and if time ever stops, then this statement will no longer be able to make sense.
it has been around for a long time.
The time football has been around for is a long timeFootball has been around for a long time but we do not know how long it has been around
a long time
a long time
A long time.
a very long time
a very long time
along time.
the same time that any people been around.
something has been around a long time
"The Simpsons".
Since the beginning of time.