There isn't a set rule for the ideal number of blocks your maze should have.
However, keep in mind that, in unmoderated testing, testers' attention will significantly drop the longer the maze lasts.
An unreasonably time-consuming maze may cause participants to disengage and abandon the test. Pay attention to blocks that can be particularly time-consuming, such as prototype/website tests and card sorts.
Here are a few factors to keep in mind:
Setting the right expectations
At the start of a maze, it's important to be clear and transparent about all the relevant details.
This includes providing an estimate of the time it will take to complete the maze, as well as whether you will provide an incentive for participation.
If you're offering an incentive, the test can be longer.
Without an incentive, a high number of blocks is more likely to result in fatigue impacting the quality of the answers and the abandonment rate. If no incentive is involved, you may have better results if you keep the number of blocks under eight.
You can set up a URL redirect in the Thank You screen to reward testers who completed your maze. For example, you can direct them to an incentives platform where they can claim a reward or use a custom discount code.
This limitation is in place to ensure that testers are compensated fairly for their time.
Your Maze plan
If you're on the Free plan, there are restrictions to the number of blocks you can add to a maze. Upgrade your team to increase the number of blocks you can add in a maze.