Why does the Sun spend vastly different amounts of time in different constellation regions along the Ecliptic?
Answer
The actual, irregularly shaped constellation boundaries defined by the IAU are not evenly spaced.
The time spent in each region varies because the boundaries of the constellations, as mapped by the IAU, are not uniform or precisely $30^{\circ}$ apart; they have irregular shapes.
#Videos
The Ecliptic: Crash Course Kids #37.2 - YouTube
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