Hourglass form or material bonus?

Games Discussion Ars Magica
1

I figured that a hourglass should be +3 to tell time & +2 to age objects?
Other than that I’m stumped, any help would be appreciated greatly.

2

The official (core rule book, p110) Shape & Material bonuses for an hourglass are
+3 increasing speed; +7 timing and alarms

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3

I'm always a big believer in shape and material bonuses are one where the books gives a guideline, the SG and player can talk it out.

Spells like Bane of the Decrepit body and Dust to Dust, for example, an hourglass should assist.

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