spinning your spool voids your warranty? better not take it to the lake then!
my point of view is that I've never had a cast longer than 4 seconds let alone 2 minutes. The difference is the acceleration and torque between a stock and tuned reel. A tuned reel will require less torque and effort to cast and flip. The difference in casting distance would be at best a few feet. flipping on the other hand will improve as you can get a few more feet with much less effort as its a technique that requires the spool to be fast enough to not slow down the baits momentum. As dvt stated, with less effort you can focus on accuracy (ever throw a baseball as hard as you can...very little accuracy)
so in my opinion, free spool timing is just another measurement for very modest results. It's not the be all end all.