Answer:
What time starts and stops with an βnβ?
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
What grows when it eats, but dies when it drinks?
What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?
I start in little but I end in full, you'll find me in half and complete.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?