Wearing Aligners for 17 hours a day?

Went to the DC Smile Scan Center about 10 days ago and I just received my smile treatment plan. it states that my treatment is only 4 months long? and i only have to wear the aligners for 17 hours a day? This seems almost too quick.. I am excited about this...but from all the reviews I have read no one has been instructed for less than 20-22 hours a day. Has anyone had a similar situation to me?

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