Calendar

Time it takes to get to know someone on the most minimal of levels. One year.
Time it takes to get to know someone before they get to meet your siblings. 6 months.
Time it takes to get to know someone before they get to meet your parents. 16 months.
Time it takes getting bothered by someone before you actually spend any planned, non-required time with them. 4 months.
Time it takes getting bothered by someone before you actually spend any planned, non-reqiured time alone with them. 6 months.
Time it takes before you appear before someone without frills, makeup adjustments, or an unplanned wardrobe. 6 months.

Time spent fearing getting close to someone and creating rules about never allowing it. eternity.