Aries: 24 hours tops

Taurus: until they die. Maybe not even then.

Gemini: give it 30 seconds

Cancer: years

Leo: until the end of time

Virgo: couple of months

Libra: 0.2 seconds unless you really stuffed up

Scorpio: all of eternity

Sagittarius: two days

Capricorn: don't even bother apologising

Aquarius: a year

Pisces: two months maybe