We grade our personal productivity level much more than other cultures. Other cultures value other things such as community and relationships at a higher level than we do.
A story:
I was invited to an Indian friend's birthday party. It was going to be a huge party with hundreds of invited people (all Indian, except two people), musicians, a hire clown, and a full-fledged buffet. The invitation stated 6pm. I arrived at 6:30pm because, well, I expected them to start late.
Guess what, only two people were there: the birthday friend, because he had to set up the place, and a white guy, who was even more confused than me.
So the white guy and I helped our friend set up. Then we kicked the soccer ball around for a bit. Just waiting.
People started to slowly trickled in at about 8pm. I don't think we started eating at about 9pm. And it was all normal to them.