When using any splashing potion, it does not last a specified duration of time. For instance, a splash potion of 8 minutes only last for 7 minutes 2 seconds and a 3 minute splash potion lasts 2 minutes 38 seconds. Same goes for splash potions of 22 or 45 seconds.
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We're tracking this issue in MC-1149, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This is an intended feature. Hitting your head with a splash potion will give you the full duration, while splashing away from you will give you less duration (including your feet).