Using the highest level item you can select per hour is generally worth more exp.
Printable View
I use them when I know I won't be back on for a while
there are also a couple minions you can get from higher level 18 hour ventures
Assuming you can play every hour, sure. 18hr ventures are generally worth about 4x the 60m ones, so if you play one six-hour block a day you can do one overnight and five hourlies (about 9x total), with the other hour used as wiggle room. You'd have to play nine hours a day to beat that. People with jobs generally don't have that option.
I just recently had to fire a retainer because he was drinking and got into Chocobo fighting
My retainers bring back chimerical felts, Aurum Regis Nuggets and Adamantite Nugget from their 18 hours ventures.