2018 is a long time away, its hard to predict what will be "the" happening place in pharmacy in 2018.
I thought all the chains were closing their 24 hour stores? I wouldn't count on a 24 hour overnight in retail, and hospital pays considerably less than retail (even overnights), you would want to go retail chain if salary maximization is your primary concern. Also, nobody pay time and a half for overtime (maybe in a rare dire situation, but certainly not average.) Urban areas have more floaters than hours, so the idea of racking up tons of extra hours working extra doesn't work either.
Best best, a retain chain in a remote area, or possibly a job in an arabian country like Saudi Arabia or Abu Dhabi