Hi my miner is mining @46kh

(18 hours a day) what do you think i get in btc a day?
and how long do you think it will take to earn enough btc to buy one of them BIG GPU's like a r9-290, or a HD 7990?
will it affect gaming when i'm mining with a big gpu?
i get around $5 a week pocket money to add to buying a gpu to.
