Making money on a HubPage assumes that (1) you have picked a topic that has an audience, (2) write some good content and (3) use some keywords that people might use in searches. Without these, there is little or no money.
The time to start getting revenue will vary depending on how well you do these things and how quickly you build the right audience. It can happen quickly or take months. You HubPages have to get indexed in the search engines and be found by Internet surfers. The first visitors to a HubPage are typically other Hubbers, who might click ads, but are generally not your money audience. Gradually as you pick up visitors from Google, you revenue can kick in.
The beautiful thing is that, if you write good HubPages with the three qualities mentioned, you will make money (if only cents), and it will likely build over time. The first Google check might take a year to earn, but over time the cycle shortens. Internet article writing is not a quick buck!
It's a little like planting a garden... plant good seeds, tend the plants, and enjoy the harvest...