Slightly late to the party, but I would most definitely say yes.think of it like a hex version of spell storing. You still cast it, it just.. took forever to affect them. (Hex vulnerability can let you get around this limit tho btw.
The feat called Accursed Hex can also get around the limit, but you have to Hex the same target again by the end of your next turn.
You could also take the feat called Spell Hex and turn the spell Hex Vulnerability into an SLA usable 3/day... otherwise, the chances of a 1st-level spell being effective greatly decrease as you gain levels.