請問關於美國入境簽証問題，以前入境簽証有效期是三個月， 不知現在是否都是三個月？ 現在去美國領事館申請簽証輪候日期長不長？ 謝謝！?

You are totally wrong.

1. In the past (without visa-free travel), a travel visa holder can enter the U.S. for up to 6 months.

With visa-free travel (with ESTA approval), a Taiwanese Passport holder can enter the U.S. up to 3 months without a physical visa.

It was never 3 months with a travel visa.

2. Better, given a travel peak season has just passed.

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中華民國護照是免簽吧？