Hyphen question.

"Hour-and-a-half's drive to the nearest Marks and Spencers, Robert, an hour-and-a-bloody-half."
Is that the best way to punctuate that? My worry is that the second form is different from the first, since it is no longer a description of the drive but is merely an amount of time - and a "bloody" has inserted itself by tmesis. Any suggestions (that don't change the actual words, which might be technically inaccurate - "Marks and Spencer" is the correct name of the shop, for example - but are what I want this lady to say)?
Cheers.
Peasemarch.