7 months

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Sold with a bunch of stuff for Misty Skull Master's Yellow Belt:

http://backpack.tf/profiles/76561197976353061?time=1424246400

http://backpack.tf/profiles/76561197976353061?time=1424334519

Sold for Circling Heart FR-0 (1.9) + 8 keys (8/12) + 6.5 keys in sweets (6.5/12):

http://backpack.tf/profiles/76561198013886978?time=1423468800

http://backpack.tf/profiles/76561198013886978?time=1423555200

(1.9 + 6.5/12) * .9 + 8/12 = 2.8642 buds

Rounded to 2.9 buds

Sold for Circling Peace Sign Thirst Blood (2.6):

http://backpack.tf/profiles/76561198063258426?time=1423296000

http://backpack.tf/profiles/76561198063258426?time=1423405476

2.6 * .9 = 2.34 buds

Rounded to 2.3 buds

Sold with 5 keys (5/13) for Misty Skull Bombing Run (2.4):

http://backpack.tf/profiles/76561198084491517?time=1422000000

http://backpack.tf/profiles/76561198084491517?time=1422086400

2.4 - 5/13 = 2.0154 buds

Rounded to 2 buds. Presumably offered.