Assertion: sun's phase | /r/CapableOf | span over two hours
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Source sentences:
text: This practice must be undertaken carefully, though the extreme fading of the solar brightness by a factor of over 100 times in the last minute before totality makes it obvious when totality has begun and it is for that extreme variation and the view of the solar corona that leads people to travel to the zone of totality (the partial phases span over two hours while the total phase can only last a maximum of 7.5 minutes for any one location and is usually less).