Polecat. Polecats are solitary and predominantly nocturnal weasel-like animals, where the males are quite obviously larger and heavier than the females. They produce a strong musky scent from anal glands when threatened, and this is also used to mark their territories.
Effexor withdrawal symptoms can easily last two months or more, and some people don't feel back to normal even after a year of discontinuation. Because effexor has a 'half-life' of about five hours, withdrawal symptoms can develop from missing only one dose.
A closer estimate can be calculated if you know the drug's half-life. The half-life of Effexor is 5 (+/- 2) hrs for the parent drug and 9-13 hours of the active metabolite. So after 5 hours, half of what you've taken (your dosage) would be metabolized. 5 hours later, half of that and so on. (In Effexor's case, calculate according to the metabolite's half-life and the dosage you took)