I think it’s a rounding thing. Looking at an analog clock, you’ll see at a glance that the hand is about halfway around the circle but it takes an additional processing step to determine whether it’s 6:31 or 6:29. Looking at a digital clock, you’ll see that it’s 6:29 first and then it takes another step of processing to determine that 29 minutes is roughly halfway through the hour.
I think it’s a rounding thing. Looking at an analog clock, you’ll see at a glance that the hand is about halfway around the circle but it takes an additional processing step to determine whether it’s 6:31 or 6:29. Looking at a digital clock, you’ll see that it’s 6:29 first and then it takes another step of processing to determine that 29 minutes is roughly halfway through the hour.