Fun Riddles

Question: I am a digit, but two of the ten.
Two of me make a promise.

What am I?

Question: A rooster lays an egg at 6:00 AM. When does the farmer find it?

Question: A jungle is 4 miles wide. A blind boy wants to see how far he can walk into the jungle.

How far could he possibly go into the jungle?

Question: What word doesn't belong in this group? That, hat, what, mat, cat, sat, pat, or chat?

Question: The more of me you have, the longer your life.
The more of me you have, the less you have left.

What am I?