It may be that I'm old school however before I go to a venue I do my homework, know what weight will I will need to win/frame, know what bait I will need to take/use and where I need to draw. The above will tell me roughly how much to feed at the start and then it's a case of trial and error, stepping up feed, changing baits, feeder size and presentation by casting and reducing feed accordingly.
How does a stop watch tell you to do the above, because it's knowing what and when to feed, how much grounbait, how many particles and how big a feeder to deliver it in that makes all the difference. A watch only tells you the time, the rest comes through experience and practice.