they state that it is an estimating problem and not because they "don't value my time."
Then you know what? They need to WORK on that problem instead of just telling you that they have that problem. The need to take responsibility/accountability. I usually leave myself and extra 15-30 minutes. Often this means I end up waiting around but I am almost always on time. I buffer and miscalculations with extra time - because I value being on time for my friends. Once or twice it's an estimating problem - after that it means that they can't be bothered to take the time to estimate correctly and accurately.
no subject
Then you know what? They need to WORK on that problem instead of just telling you that they have that problem. The need to take responsibility/accountability. I usually leave myself and extra 15-30 minutes. Often this means I end up waiting around but I am almost always on time. I buffer and miscalculations with extra time - because I value being on time for my friends. Once or twice it's an estimating problem - after that it means that they can't be bothered to take the time to estimate correctly and accurately.