i think 0.01 GHS at cex.io will not mine you anything. i mean it will always say mined BTC and your share is 0, so you will not get any coins from mining.
also i tried mining with 6-7 GHS recently and the maintenance fees were ridiculously high
it will mine but the earnings will be lower than maintenance fees so youll get negative balance until they will stop it from mining
i think minimun Ghash for get a little "faucet" on mining it is 10Ghash...
you can get 7K sat/day NET with this power....
so voucher under 10GHASH are made just for wasting time...