The US ESTA for Japanese travelers is valid for 2 years, or until the associated passport expires, and allows you to stay in the United States for a maximum of up to 90 days.
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You must apply for a visa (B2 visa) if you want to stay in the U.S. for more than 90 days, no matter what the reason. You must apply for a visa (B1 visa) if you are traveling to the U.S. for employment or business purposes involving remuneration, even if not staying longer than 90 days.
There is no minimum balance requirement for your bank account, however, based on the experience of others we recommend anywhere between $5,000 to $10,000 will be sufficient.
You must apply for a visa (B2 visa) if you want to stay in the U.S. for more than 90 days, no matter what the reason. You must apply for a visa (B1 visa) if you are traveling to the U.S. for employment or business purposes involving remuneration, even if not staying longer than 90 days.