How long is it ok to run across the lake at 4500 rpms? Is it out to run from one side or the lake to the other for 8 to 10 minutes at 4500 rpms? I have a 14 3/8 x 18 prop and it gets out of the hole very well but top speed is about 45 mph at 4800 rpms. Is it ok to turn 4300 to 4500 for 5 to 10 minutes?