I agree, you gotta know the weigh in time!!
Make as many quality cast as you can, meaning make every cast count... Hit your spots and don't waste time in an area that is unproductive..
And most importantly, don't get in a hurry as time get close!! Take you time working your bait, slow down and relax.. I've caught a lot of fish with less than 15 mins left..
Good luck and have a good time!!!