The first review may take up to 7 days. And any subsequent request will take over 28 days. Please be patient. If you have high-quality unique content and you get more than 1000 visitors then you have a chance of getting approved. They get more Adsense application requests then the total available advertisements. This gives them the flexibility to choose only high-quality websites and blog. 2 or 3 years ago it was easy to get into Adsense with any kind of content. It's not the same anymore. Eventually, this policy helps all concerned parties. Also, Adsense is not the only program. While you wait for your application to get approved, try Amazon CPM ads. You can make around 2 dollars for every 1000 visitors apart from normal affiliate sale earning. CPM ads are guaranteed way of getting money.
Still, you need only Adsense account, you can hire at a nominal fee.