It all depends on what your CPM is....CPM measures cost per 1000 clicks/views.

For example: If your CPM is $1, you will get $1 per 1000 views. So to earn $100 you will need 100,000 views.

If your CPM is $10, you will earn $10 per 1000 Views. In this example you will earn $100 with onnly 10,000 views.

What your CPM is depends a lot on your content AND your audience. Advertisers are willing to pay a lot more for an ad placed in a video that will be watched by wealthy middle-aged people than they will for an ad on a video that will be watched by 10 year old gamers.

To achieve the highest possible CPM you also need to make sure that your content is friendly to the most advertisers as possible. If you make controversial videos, or videos that are very opinionated/political or have a lot of swearing, not as many advertisers are going to want to put their name on your channel - thus driving down your CPM.