Can Detect Magic tell me how many spells of a given school are affecting an object?

Question

The detect magic spell allows the caster to:

use [their] action to see a faint aura around any visible creature or object in the area that bears magic, and [they] learn its school of magic, if any.

The functionality of this ability is clear when an object only bears a single magical effect. However, it is less clear in the case of multiple magical effects on a single target. If the magical effects all have different schools, we can probably infer that the caster of detect magic sees a distinct aura for each school and can determine from this information that (at least) 3 spells are affecting the target.

However, suppose a target is affected by 3 different abjuration spells. Obviously the caster will see an abjuration aura on the target, but how much information will they be able to glean? Will it be obvious to the caster that there are actually three separate abjuration auras, and therefore three spells, on the target, or will they only know that there is at least 1 abjuration spell on it?

Answer 1

RAW, you do not learn additional information

In the description for Detect Magic, the sentence that describes how auras appear is written like this:

you can use your action to see a faint aura around any visible creature or object in the area that bears magic, and you learn its school of magic, if any.

Note that there's no distinction on "spells", only that the object must bear some kind of magic. If an object bears three distinct sources of Abjuration magic, the person who casts Detect Magic is only able to discern the school of magic, not how many sources there are or how powerful the effect is.

Personally, as DM, I'd probably permit an Arcana check (with varying levels of partial success) to glean that kind of information, when a character uses their Action to detect the specific auras on an object. That's not a strictly RAW ruling though.