Example: Just make sure to hold onto happiness when/whenever you get the chance. Should I use when or whenever in this case? When should I use the former and when should I use the latter?
grammar - When to use "when" and "whenever"? - English Language ...
Using whenever in OP's examples always strongly implies that the "conditional / hypothetical" scenario referred to has happened more than once in the past (and could be expected to happen again in the future).
Is there a difference between when and whenever? Yes. whenever has built-in emphasis. The logical factual outcome may have been the same but meaning involves more than fact; it involves the speaker's attitude towards the utterance, their emotional involvement in it.
Do "if," "when," and "whenever" all result in the same meaning here?
Is it better to say in a professional email: we can schedule a call when you are free Or We can schedule a call whenever you are free What's the difference?
sentence construction - When you are free or whenever you're free ...
You can call me whenever it's convenient for you. The phrase "at your convenience" is sometimes used: You can call me at your convenience. If I were to combine the two, I'd probably put the "any time" part first: You can call me anytime that's convenient for you. If the part about convenience goes first, then anytime can be used for emphasis:
If your request is not urgent, then you could say "Call me whenever you get the chance" or "Call me whenever you can". It's also worth noting that if you mean to request that someone return your call, you would usually say "Call me back".