Yeah, I think around .4-.6 of the ceiling height is fine so like 8-12 s in a 20 ft gym. That way most top teams would have to calculate and practice to get that time while the middle teams would have to get at least get a good launch. Otherwise 5-10 seconds for regionals, 10-15 for states, and 15+ for nats seems fine to me. I think the bonus shouldn't be enough to make or break a team but push a team that practice a lot and mastered their glider over a team with a slightly better glider without much practice besides enough to get a good time. I think 10 seconds/points is enough. Since most good scores for 2 flights are around 30-60 seconds, 10 seconds is actually quite significant, enough to bump a team up a few spots. I don't think that just getting target time once should outweigh getting 2 very good flights.The problem i see with one or the other is how low the bar should be for the bonus flights to be a reasonable bonus.
It has to be low enough that any team that works at gliders can achieve.
A great time is a drop of 1.2 seconds per foot. A good time is .9
At our state there were three teams at or above a good time. The most were about .5 to .7
One good flight will outscore one bonus flight by nearly double. Hardly worth the bonus.
So 2 bonus flights of up to 10 points for getting close of the target time sounds fine. Calculation would be easy, 10 - (percent error x 10). Another idea is just to incorporate the target times in the flights themselves so competitors have to choose whether to get closer to the target time or improve on their best time (makes the teams think about their options).