That sounds like a likely cause for the problem you are seeing since the default build time limit is 1h (my access rights to your project do not let me verify this, though).
You need to go to GitLab to fix this, so it is a bit tedious, but it is something you can do yourself.
- Access the project in GitLab
- Go to the
CI/CDsettings
- Expand the
General Pipelinesettings
- Update the build time limit and save settings
Let us know if that fails to fix the problem or you have difficult carrying out these steps.