Answer:
Longer than a decade and shorter than a milennium
What does someone else have to take before you can get?
I can be found in seconds, minutes and centuries, but not in days, years or decades.
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
Spies and detectives do this to phones and musical shoes make this sound.
I am a room that has a roof but no walls. What am I?