The meaning is that it is the right time to do something.
Having fun;Great time
It's not an idiom - it means just what it says. Something took "no" time to come about. It's an exaggeration, but the meaning is plain.
The idiom 'sands of time' refers to the inexorable forward movement of time. It refers directly to the sand running through an hourglass.
The idiom 'on the dot' means at a precise time or right on time.
It means precisely at that time - no earlier or later.
This isn't an idiom. It means just what it seems to mean. Something is only a matter of time - you only have to wait until it happens.
"To be" is not an idiom - it's a verb.
Pest is not an idiom. It's a word.
The idiom "apple shiner" means the teacher's pet.
The meaning of the idiom in the pink of health means being in good health.
This idiom's meaning is when someone has been a fool for a long time, they are the most foolish because they haven't learned better. A way to rephrase its meaning is.. "The longer a person's been a fool, the more foolish they are."