Is it not too long ago or not to long ago?

not too long ago

"Not to long ago" is wrong.

The former one,that is not too long ago.

"Too" can be a synonym for "very." Not very long ago.

If you mean the time idiom, it's "not too long ago" ... where "too" means "more than wanted" / "excessively".

not long ago -

http://www.oxforddictionaries.com/us/definition/american_english/not-long-ago

Not too long ago.

Not so long ago.

Not too long ago.
To means for something or is used when you are going somewhere. You give a card TO your mom. You go TO the store.
Too means a lot or also. I want too go, TOO. You took TOO much pie.
Since you are saying that something happened not long ago, use too.
Hope this helps! :)

It is "not too long ago". This is because "too" usually refers to the quantity or amount of something.

Examples:

"It was too expensive."

"I'm going to school."