If the time limit doesn't work, I might suggest a "mass" limit... basically a (relatively) low limit of the amount of handwavium she can have "set" at a given time. Depending on how it's set up, it could be either a "no more until earlier batches get used", or earlier batches go bad as she goes over the limit. The latter might, at least at first, be mistaken for a time limit.
For the "relatively" part, it might just be enough for her to completely handwave, say, a car. Which would make it useful enough she'd have a steady job for that sort of thing (very low quirk space vehicles and tech are gold), but wouldn't necessarily create a potential manufacturing "blow out".
She'd probably also find work with organizations like Great Justice, helping to identify traits of captured devices.
--
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
For the "relatively" part, it might just be enough for her to completely handwave, say, a car. Which would make it useful enough she'd have a steady job for that sort of thing (very low quirk space vehicles and tech are gold), but wouldn't necessarily create a potential manufacturing "blow out".
She'd probably also find work with organizations like Great Justice, helping to identify traits of captured devices.
--
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor