please note: large fonts on low boot screen resolutions can corrupt the boot screen
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Because this problem depends on chosen font, it isn't possible to define a general maximum. When you're trying to select a larger font, please do it in small steps (rebooting and checking the results).
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The problem occurs when the grub gui elements (borders, description) wont fit into screen. So while there's enough vertical space you can try a larger font. The mass of menuentries is not a problem - they are scrolled if required.
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The corruption results in a endless loading time of grub2. You need a live cd to fix this:
* delete the font from (MOUNT)/boot/grub/unicode.pf2
* reboot your system (menu should show up with default fonts)
* open /etc/default/grub with root permissions and place a '#' in front of the line containing GRUB_FONT
* then run grub customizer to choose the font used before