Not very bright at all. The process of becoming blinded by light is because the iris contracts when the light level increases. The reverse process of dilation is slow for humans, so the return to darkness leaves your eye with insufficient light coming in to see in the environment you suggest. This isn't a binary factor.
The VA calculates the rate of pursuit by dividing the number of credit hours being pursued by the number of credits considered to be full-time for the term. As as example, if the term is 10 to 13 weeks in length, 12 credits is considered full time. If the term is 8 weeks in length, 8 credits is considered full time.
Universities consider 12 credits for undergrads to be fulltime and 9 credits in grad school are fulltime. Grad school students often have funding jobs- teaching/research on top of those credits as well. Taking 12 credits per semeste rwould take 10, not 8 semesters to get 120 credits for an undergrad degree.