8 months

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Sold for 56 keys + .5 keys in sweets:

http://www.tf2outpost.com/trade/25300622

http://i.gyazo.com/40ba2480f8cbf7c494b603832230de82.png

http://i.gyazo.com/a379dfd407101a519f8f8a05c1bec78f.png

http://backpack.tf/profiles/76561198106869848?time=1426230000

http://backpack.tf/profiles/76561198106869848?time=1426316400

http://backpack.tf/profiles/76561198091968935?time=1426230000

http://backpack.tf/profiles/76561198091968935?time=1426316400

(56+.5) / 10 = 5.65 buds

Rounded to 5.7 buds

Sold for Midnight Whirlwind Taunt: Rock, Paper, Scissors (unpriced) + 1 bud:

http://www.tf2outpost.com/trade/25280079

http://backpack.tf/profiles/76561198091968935?time=1425628800

http://backpack.tf/profiles/76561198091968935?time=1425715200

http://backpack.tf/profiles/76561198106953515?time=1425542400

http://backpack.tf/profiles/76561198106953515?time=1425715200

Could not track the BMOC.

[Sold with Purple Energy Cosa Nostra Cap (5) + 1 bud] for Purple Energy Blighted Beak (12):

http://www.tf2outpost.com/trade/25231482

http://i.gyazo.com/1080be00e2bd2dc17ab38ec453a2d22b.png

http://backpack.tf/profiles/76561198154899581?time=1425257285

http://backpack.tf/profiles/76561198154899581?time=1425456000

12 - 5 - 1 = 6 buds

Estimation here should be close.

Sold for 4 buds + 12 keys (12/12):

http://www.tf2outpost.com/trade/24880572

http://i.gyazo.com/3431531a40b7ee12899c0ab4ca771dad.png

http://backpack.tf/profiles/76561198036032211?time=1424050969

http://backpack.tf/profiles/76561198036032211?time=1424073600

4 + 12/12 = 5 buds

Sold for:

~2 keys in sweets (2/10):

http://i.gyazo.com/d5960432e70070f7987ad7de43b362e9.png

http://backpack.tf/profiles/76561198053875960?time=1426230000

http://backpack.tf/profiles/76561198053875960?time=1426316400

((27 + 27 + 3.5 + 5 + 3 + 2) / 10) * .9 = 6.075 buds

Rounded to 6 buds

Sold for 66 (?) (66/13) keys?

http://www.tf2outpost.com/trade/24800954

http://i.gyazo.com/28030179c959167a59a42216fa005765.png

http://backpack.tf/profiles/76561198075837575?time=1422172800

http://backpack.tf/profiles/76561198075837575?time=1422259200

http://backpack.tf/profiles/76561198116801784?time=1422172800

http://backpack.tf/profiles/76561198116801784?time=1422259200

66/13 = 5.0769 buds

Rounded to 5.1 buds

Probably missed some keys here.

[Sold with Strange Professional Killstreak Festive Ambassador (10/12)] for [Strange Professional Killstreak Australium Sniper Rifle (50/12) + Dead Presidents Frenchman's Beret (1.55)]:

http://i.gyazo.com/4ab1d1749431fc7b9cb8e3087b2ca867.png

http://backpack.tf/profiles/76561198131235654?time=1424073600

http://backpack.tf/profiles/76561198131235654?time=1424160000

(50/12 + 1.55) - 10/12 = 4.8833 buds

Rounding up to 5 buds. DP Beret was more than 1.55 buds at time of sale. Applying overpay results in an unusable value.

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Pro KS Gunslinger:

http://backpack.tf/classifieds/?tradable=1&craftable=1&australium=1&item=Sniper%20Rifle&quality=11&killstreak_tier=3