I know that both of them mean "In 10 minutes" but I don't understand the difference between them.
I have some examples which kind of tell me which one has to be used in different situations but I saw an example when both options can be used.
Here are the examples:
I can assume that 「後」can/must be used when talking about the end or the beginning of something.
Sentences where both options were used:
So, what is the difference between with and without 「後」?