time lag
noun [ C usually singular ] uk/ˈtaɪm ˌlæɡ/ us/ˈtaɪm ˌlæɡ/
（两个相关联事件之间的）时间间隔，时间差；时滞
a period between two related events
There's a time lag of about a week between having the blood test and getting the results. 从验血到拿结果大约要一周的时间。
Synonyms: delay wait
See also: lag noun (DELAY)