Don’t understand the metric unit

[anilsomisetty]

Why are we mentioning GB*seconds as unit for cumulative memory on UI of the query ?

Example:
Cumulative User Memory | 15.5GB*seconds

and why do we divide the cumulative memory by 1000 here even though query.queryStats.cumulativeUserMemory value is in bytes ?

formatDataSize(query.queryStats.cumulativeUserMemory / 1000.0) + "*seconds"