It depends on how many website visitors click on your Adsense ads and the amount the advertisers are paying per click.
Let's assume you get $0.25 per click you would need 400 clicks to earn $100.00 to get 400 clicks you would probably need at least 60,000 unique website visitors.
Not everyone clicks ads so it can take quite a bit of website visitors to earn some money through Adsense.
Of course your cost per click may be higher than $0.25 so if you got $2.00 per click and got 400 Adsense clicks per month then you'd make $800.00 per month if the ads all paid $2.00 per click.
Some even pay more per click than that but it always depends on what niche your website is in.
Some Adsense website niches pay higher cost per click than other niches.
So pick a topic you're passionate about and choose a high paying Adsense niche to really earn the money and give it time.
Earning a living through adsense is possible but is not achieved overnight.
The successful bloggers getting huge Adsense payments have worked on their websites for at least a decade or more.