The short answer is no, but there two relevant answers to your question and you should pay attention to both.
Focus Addiction
If you rely too much on the power granted by foci, you might
form a mental and spiritual dependence on them (Substance
Abuse and Addiction p. 413). Typically, it’s not a danger as long
as the total Force of your active foci isn’t greater than your
Magic rating. If you do get hooked, you might find you need to
bond more powerful foci, or have trouble deactivating them. In
more severe cases, you might become psychologically unable
to practice magic without a focus.
This is what that section is warning against. They Key word is ACTIVE foci. Your GM is licensed to mess with you should you have more then magic total force of foci active. So if you run around with more then you magic in foci force just make sure you keep only the ones you really need active, and only go above you magic rating when you really must. (And that really must better be counted in seconds.)
The real foci limit is this:
You can’t bond more foci than your Magic attribute,
and the maximum Force of all your bonded foci can’t exceed
your Magic x 5. Regardless of the number of bonded
foci you have, only one focus may add its Force to a
dice pool for any given test.
For most that means, no more then 6 foci no more then 30 "force" worth of foci, this should never a problem for a starting character.