@inDigital If you’re comfortable working with the API you can set it 30 minutes yourself with this guide:
https://answers.netlify.com/t/support-guide-how-to-use-the-api-to-increase-your-sites-build-time-limit/52805
If you wanted to do it via the UI you should ‘like’ this feature request that I made in late 2021:
https://answers.netlify.com/t/self-service-maximum-build-time-limit/46783
If you don’t want to use the API Netlify’s staff will increase the limit for you.
If you want a build time greater than 30 minutes I believe you need to be on a Pro plan as mentioned here:
https://answers.netlify.com/t/support-guide-how-to-use-the-api-to-increase-your-sites-build-time-limit/52805/42
(Note: You may already be on a Pro plan, I have no idea, I don’t work for Netlify - if you are, then all you’ll need to do is wait until they assist)