A relaxed usage of the clock - involving arriving late or not paying much attention/placing much importance to the time.
'Well, we're only an hour late - it's a Cornish 5 o' clock.'
'Morwenna's always running on Cornish time - she's always late.'
'Morwenna's always running on Cornish time - she's always late.'
by frustratedwench91 February 18, 2018