I'd think a temporary aspect would go away right after it was used. How can that spell last all day for the default complexity of 3 shifts? In other words it would cost the default 3 to get the default duration of up to a day?
A manoeuvre applying a temporary aspect like that is always a minimum of 3 shifts. The spell duration would most likely default to a scene, so the spell would probably end after 15 minutes or until it was tagged. You could call the spell 4 shifts if you want it to be a sticky, in which case it would still last for the 15 minutes, but tagging the aspect wouldn't make it disappear; you could pay a fate point to use the aspect again. Alternatively, you could pay for extra tags (3 shifts each) but this still wouldn't extend the duration of the spell.
To make the spell last for a whole day, you would have to pay additional shifts for each time increment above the original duration (check the reference sheets at the back of the book/pdf). So to make the basic 3 shift aspect last for half an hour, you'd have to pay an additional shift. To make it last the afternoon (8 or 12 hours) it would be an additional 4 shifts and the whole day would cost you 5 extra shifts.
So to make a temporary good luck aspect ritual that lasts for a day, it will cost 3 shifts for the aspect and 5 for duration; that's 8 shifts of complexity in total. You could make it a sticky aspect for an additional shift, so that even once you've used your free tag on the aspect, the spell would continue to run until the end of the day and you could invoke it with fate points just like a normal aspect.
So you could pay 3 shifts for the aspect, 5 shifts for duration, 1 shift to make it sticky (so it sticks around once the free tags have been used) and 6 more shifts for two additional free tags (3 shifts x 2).
This would give you a ritual that would cost 15 shifts of complexity, it would give you a good luck aspect all day and would allow you to tag it three times for free. A handy spell.
Hope that helps.
Edit: And as Luminos has said above, there isn't a default duration for each spell in the book, you just need to go with what seems to make sense. If you aren't sure what the default duration would be then speak to your GM to see what he's happy with and take a look at the time increments table in the book/PDF. Generally I would rule that most aspects last a scene and most wards last a day.