请看英汉词典的解释：
for:〔表示时间、距离、数量等〕历经,达,计.for hours [days,years] 有(好)几小时[(好)几天,(好)几年].the meeting lasted (for) an hour 会议继续了一小时.run (for) a mile 跑一英里路.★ 在上述情形下,for 常可略去.
I'm going hiking for two hours.为什么这里要加for?
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