Elapsed time refers to the time that passes between two events.
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Elapsed time
About 4 months.
It could be called... the waiting period intermission interim interval break rest recess
they are events that can't occur at the same time. For example, you toss a coin you get head or tails. These are complementary events since you can't have both at the same time, only one!
Two events that cannot occur at the same time are called mutually exclusive.