he spoke at length : FOR A LONG TIME, for ages, for hours, interminably, endlessly, ceaselessly, unendingly.
he was questioned at length : THOROUGHLY, fully, in detail, in depth, comprehensively, exhaustively, extensively.
his search led him, at length, to Seattle : AFTER A LONG TIME, eventually, in time, finally, at (long) last, in the end, ultimately.
2192; headword