Yes, it FEELS.
Never forget that human intuition is usually misleading when it comes to statistics and probabilities. Our minds evolved to distinguish patterns, not randomness. That's why we see patterns where there are none - in clouds, for example.
Here's the thing with dice rolls:
If you roll 10 ten-sided dice, and compare it to one 100-sided die, the probability distribution is quite different. With the 10 dice, the probability of getting a very low or very high value are very, very small (the probability to get a 100 is 0.00000001%). With the one die, the probabilities are equally distributed, 100 is as likely as 60 or 50 or 1.
So doing the same randomness-based thing several times instead of once means your end result will be closer to the average, and neither better nor worse. Statistically speaking, if you do it very, very often. On every individual case, it can still be all over the place.
However, that is all only partially true for BM actions. Very few of them are purely random. Usually, they depend on your skill, some region statistics, some other values, and then there's some randomness added. Since these values could change when you do something, doing it again is not simply rolling another die. Depending on how the relationship is, it might be better or worse. For example, if you do something that, say, raises morale, and what you do is more effective with low morale, then doing it once with a large amount of hours is better than doing it in several small steps. But if it is more effective with higher morale, it is the other way around. And when it depends on other values as well...
Basically, stop trying to game the game. There are very few cases where I can imagine that such an approach would yield any measurable advantage. I am very sure that almost all of the cases where something gamey is going around as good advise are purely thanks to some kind of placebo effect.