ImagemagickExecManager has a hardcoded time limit of 60 seconds. While 60 second is already quite long, there are situations where it does not suffice.
For example, if you have (legacy) project with images that are way too big (dimensions and or filesize, you could downsize them using the image_resize → module, but you are likely to still hit the duration limit.
There are many ways to make this configurable.
Since the default value does make sense for 99% projects , I've opted to use Drupal\Core\Site\Settings for my case.
This makes it a bit more 'difficult' to add an override, compared to providing a config field for example.
Regardless of the solution, this should be offered as a 'use at your own risk' option.
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4.1
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Thanks, this seems reasonable. Would you mind adding a note in the README to explain this?