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Welcome to Atlassian Community.
Although we don't have an exact number of lines/characters limits to render Markdown files, as it depends on how many Markdowns command you are using, we do have limitations on the time it takes to render the file in the UI. If the size of the Markdown file is large, the UI might not be able to render it within threshold limit and eventually fail to load.
We are working internally ways of fixing it, and we already have created the following bug on our public issue tracker to track this externally.
I would suggest you to add your vote there, since this helps both developers and product managers to understand the impact. Also, make sure you add yourself as a watcher in case you want to receive first-hand updates from that ticket. Please note that all bug fixes are implemented with this policy in mind: https://confluence.atlassian.com/support/atlassian-cloud-bug-fix-policy-206865884.html
As a workaround, you can split the Markdown file into smaller files.
Hope that helps! Let me know if you have further questions.