cycle scheme voucher-how long does it take

am very excited. I have applied for the voucher through my works cycle scheme after trying out loads of bikes. I am just waiting now for voucher to be approved. Anyone any idea how long this takes- i knw some of it is down to how good your place is or not. Trouble I forsee is that all the new bikes come in starting september and ther are only 25 bikes left in uk my size of the bike I want and if it takes too long they may all be gone and the new spec will either be more expensive or lower spec. I hate waiting!!