No it isn't, that would be a good walking time perhaps. A good to average time for 12k would be about half of that (1hr and a 15 min), a very good time would be sub 60 minutes, and pure amazingness would be sub 45 minutes.
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(6.5+12k) hours where k is an integer.
(11 + 12k) hours where k is an integer.
There are 7 + 12k hours where k is an integer.
(12k + 6) hours where k is an integer.
There are 5 + 12k hours where k is an integer.