Typically most run three credit hours. However, there are some that may vary.
Most college/university students take about 12 credit/hours.
Usually about 150 or 250.
At the University of Georgia, an undergraduate student is permitted to take 6 credit hours per term during the summer. There are 2 summer terms, so a total of 12 credit hours is allowed.
It's usually not a state-by-state sort of requirement. Rather, it's a requirement set forth by the school's "regional" accreditor. A typical two-year (if pursued full-time) assocates degree contains sixty (60) semester credit hours (if the school's on the "semester credit hour" system), or 90 quarter credits (if the school's on the "quarter credit" system). Most schools in the US are on the "semester credit hour" system, but some are on the "quarter credit" system. It all just depends on the school.
It would take 19 and a half days.
About 5 and a quarter
That's going to depend on how many hours went into the 1.98, and how many hours you can take in the new quarter. I just worked it out quickly and can't guarantee that I'm right, but the result I get says that on a 4-point grading system, in order to raise a 1.98 GPA to a 2.5 in one quarter, you have to take a shade more that 1/3 as many hours in the new quarter as were in the 1.98, and get straight A's in all of them.
One quarter of a day (24 hours), or 6 hours.
If you take 15 credit hours per semester and go 2 semesters per year it is exactly 4 years.
For colleges and universities that operate on a regular semester system, 30 credits would be approximately two years for a full-time student. 30 credits places a student at sophomore student status.
The average flight time from Ohio to Hawaii is about 9 hours and 30 minutes. The flight can take longer depending on if there are any layovers or connecting flights.
It's roughly 75 miles, so figure an hour and a quarter.