Is it ten years to apply for a U.S. tourist visa in Japan?

Normally it is ten years. You can also get a ten-year visa in Tokyo, but whether you will be granted a ten-year visa is decided by the visa officer based on the information you provide, and his decision is final. And if you don't like it, you may be given one year. In other words, you have the possibility of obtaining a ten-year visa, but whether or not you will be granted a ten-year visa is not your “right”.