i think it is not so difficult to earn o.1 bitcoin from in a week. if you invest your money in alt coin then you can really earn o.1 bitocin may be more just in a week. i seen such kind of people who earn 0.5 bitocin in a week.
If you buy a good altcoin such as the Ethereum, or the Moneor or even the next ZCash, you can earn a lot.