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This is a follow up to How to construct potential form for adjectives
I'd like to know how to say "can be x" where x is an adjective, in a casual way. For example with a friend, this seems a little stiff: "敬語凄い長い可能性があるね。” ("Keigo can be really long.") Isn't there a casual term more relevant for this situation? かもしれない doesn't seem relevant as I'm not expressing doubt.
Your original sentence sounds better as
敬語は凄く長くなる可能性がある。
I guess that means that in Japanese it sounds more natural to say
Keigo can get very long.
rather than
Keigo can be very long.
To make that less formal, you could try to omit 可能性, i.e.
敬語は凄く長くなるよね。
Keigo gets really long (sometimes).
Other ways of saying the same thing (plagiarised from @istrasci) would include
敬語は凄く長いことがある。
Sometimes keigo is very long.
〜こと(は・が・も)ある.