The sum function had me stumped for a bit so I am posting my version for posterity.
Code:
select id, account_id, name, zoneid, class, level,
ascii(substring(profile, 237, 1)) + (ascii(substring(profile, 238, 1)) * 256) + (ascii(substring(profile, 239, 1)) * 65536) + (ascii(substring(profile, 240, 1)) * 16777216) AS 'Play Time Minutes'
from character_;
Thanks again Derision.