What is as long as

AS LONG AS

"As long as " is used to describe a condition that must exist for something else to happen. It's similar to "if"
1. used in conditionals
-You can use as long as or so long as to say that one thing is true only if another thing is true.
Ex: If you say 'As long as you are under 16, you can take part in activities', you mean'If you are under 16, you can take part in activities'.
-You use a simple form after as long as and so long as.
Ex:We were all right as long as we kept quiet.
Ex:The president need not resign so long as the elections are supervised.
2. duration
-You also use as long as to say that something lasts for a long period of time, or for as muchtime as possible.
Ex:Any stomach ache that persists for as long as one hour should be seen by a doctor.
Ex:I love football and I want to keep playing as long as I can.
-Don't use 'so long as' in this way.
Be Careful!
Don't use 'as long as' when you are talking about distances. Don't say, for example, 'I followedhim as long as the bridge'. You say 'I followed him as far as the bridge'.

HERE IS SOME LINK WILL HELP YOU

https://www.youtube.com/watch?v=dEADz1xetxU