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The dlc should have a notice about it not being refundable if you buy it in the store page.
As for the time it's two hours of you playing the game at all after buying the DLC and installing it as steam can't tell the difference when the DLC is used or the base game only.
If dlcs include stuff which can be used/consumed (like XP boosters, certain items etc.) those are usually excluded for a refund as the usage of those stuff can not be reverted.
The 2-hour limit is based on the game time from when you bought it. If you had 10 hours in the game, you would have to request the refund of the non-consumable DLC before going over 12 hours.
When requesting a refund of this type, it's recommended to do so via the "I have a question about this purchase" option. Steam's refund system can only see your total playtime on the game. It would see you are over the 2 hour limit and auto deny you, so it's better to just ask for one through the question option. Then refrain from playing the game anymore until the refund is approved, or else you'll surpass the 2-hour limit and disqualify the request.