Interval between connected events (4,3)

I think it could be either:

Which length description are you looking for?:

4,3

time lag

'interval between connected events' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for time lag that I've seen before include "interval" , "Delay" , "Gap between linked events" .)

I've seen this clue in The Guardian.

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