Wgich section of the M6 was this?
Never noticed the phenomenon mentioned by the OP on the VSL parts of M1 or M25. MAybe a difference between 'smart motorway' 'managed motorway' and 'all lane running'?
I would expect the limit to apply until either (a) a different limit or de-restriction was shown on a gantry or (b) there is an end of variable speed limit sign.
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