Continue; talk at length (2,2)

I think it could be either:

Which length description are you looking for?:

2,2

go on

(Other definitions for go on that I've seen before include "Proceed" , "Harry Secombe or Spike Milligan, say" , "Continue" , "Peter Sellers or Spike Milligan, say" , "Hired thug" .)

I've seen this clue in The Times.

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