Took me a about a year to get $100, and that's only because one of my videos got a ton of views from being tacked on as an "up next" suggested video and earned me half of that amount.
In general, how much money you get depends on how many views each of your videos is getting. YT is a bit odd in that it doesn't go all out with ads on videos that only have a couple thousand views. However, when you start hitting the range of 3k - 5k views on a video, the amount of money you make relative to views pretty much doubles. This is what I've seen with two of my videos that broke 5k.
Compared to how they (and other videos of mine that never got above 2k) performed in the first 2k views, the amount being earned went up by 2 to 2.5x. Basically I was making close to $1 per 1k views on average (as many people report is the typical case on YT), but as soon as some of my videos started accumulating a lot of views that became $2 per 1k views on average.
But in general YT advertising is a bit awkward, because it depends on if you get an ad, if somebody watches/clicks the ad, and how "high profile" the ad was. You can't really get good estimates for how much your channel can earn until you start pulling in a lot of views each month. Then you can start to see your expected pay stabilize since the numbers are high enough for the irregular nature of statistics with small numbers to finally not apply at larger numbers.
If you're only making a few dollars a week, exactly how many dollars you'll get is really random and irregular. Sometimes even with consistent views, I made a couple pennies one week, and two dollars another week when my channel was still young.
