A nicer extract for mint would be almond oil based.

Get a jar the size of the amount of leaf you have. The oil has to fill to the very top of the jar. You want as little air in there as possible. Don't mash it in but press it in tight. If you put the jar filed with oil and herbs in a pot with some water in it and heat it a little you will see most of the air trapped by the plants escape up to the top of the oil. You can also poke it a little with something to get the air out. Don't boil it - just heat it up a little. Put on lid while it's warm. I like almond oil personally.

Leave it in a room temperature place for 6 weeks, any longer than that and you might get mold on the oil.

Strain out all plant material and place in jar with dropper.

4-7 drops with tea is nice for congestion.

Alcohol tinctures really need about 3 months of soaking to be the most they can be. You just need to cover the plant material with alcohol - not have to file to top. I don't leave mine in the sun.