Have mercy on the programmers who have to maintain your software later and stick to a limit of 80 characters.
Reasons to prefer 80:
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Readable with a larger font on laptops
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Leaves space for putting two versions side by side for comparison
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Leaves space for navigation views in the IDE
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Prints without arbitrarily breaking lines (also applies to email, web pages, …)
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Limits the complexity in one line
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Limits indentation which in turn limits complexity of methods / functions
Yes, it should be part of the coding standard.