It's so long since I saw them.

[Winwin2011]

I read the following sentence from a book.

It's so long since I saw them.

Does "It's" mean "It is"? Is it correct to say "It's been so long since I saw them"

Thanks.

 

[Chicken Sandwich]

Yes and yes.

 

[SoothingDave]

I read the following sentence from a book.

It's so long since I saw them.

Does "It's" mean "It is"? Is it correct to say "It's been so long since I saw them"

Thanks.

In your last sentence "it's" stands for "it has" (it has been so long).