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abstraction > mathematical concept > number > quantity > time > hold-time
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hold-time comparison table
Subject is an instance of is a kind of has definition
time quantityA dimension distinguishing past, present, and future. In relativity, time is portrayed as a geometrical dimension, analogous to the dimensions of space.
hold-timetime The time taken to use up all the liquid cryogens, like LN2, in a cooled CCD cryostat.

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