9 months

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[Sold with Scorching Flames Le Party Phantom (11) + Roboactive Cosa Nostra Cap (7)] for [Purple Energy Villain's Veil (17.5) + Purple Energy Trophy Belt (6) + 5 buds]:

http://i.gyazo.com/e98f8403062316dbcea759a4d5b87ef7.png

http://i.gyazo.com/d52851936582961e57aab70d794affff.png

http://backpack.tf/profiles/76561198051431077?time=1425024000

http://backpack.tf/profiles/76561198051431077?time=1425110400

http://backpack.tf/profiles/76561198027650153?time=1425110400

http://backpack.tf/profiles/76561198027650153?time=1425196800

17.5 + 6 + 5 - 11 - 7 = 10.5 buds

Using this sale because hats in this sale have recently updated price and its value turned out nicely. Overpay is best ignored.

Sold with Stormy Storm Virtual Viewfinder (11.25) for It's A Secret To Everybody Pyromancer's Mask (23) + Showstopper Taunt: Spent Well Spirits (2.65) + Vivid Plasma Magistrate's Mullet (1.5):

http://www.tf2outpost.com/trade/24202930

http://i.gyazo.com/2daa7e621bb9e68bc200a3ee38fe0f45.png

http://backpack.tf/profiles/76561198066955210?time=1421604202

http://backpack.tf/profiles/76561198066955210?time=1421654400

http://backpack.tf/profiles/76561197972348237?time=1421568000

http://backpack.tf/profiles/76561197972348237?time=1421654400

(23 + 2.65 + 1.5) * .9 - 11.25 = 13.185 buds

Rounded to 13 buds

Complex sale (couldn't trace):

http://backpack.tf/profiles/76561198051431077?time=1425282565

http://backpack.tf/profiles/76561198051431077?time=1425456000

http://backpack.tf/profiles/76561198051431077?time=1425456000&compare=1425282565

http://backpack.tf/profiles/76561197977533086?time=1425196800

http://backpack.tf/profiles/76561197977533086?time=1425283200

http://backpack.tf/profiles/76561197977533086?time=1425196800&compare=1425283200

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Secret Mancer:

http://backpack.tf/vote/id/5508c435b88d8873438b4594