1 Answer. You were correct. From time to time is the only standard version. I found the hyphenated version only in yourdictionary.com which is a wiki and is not authoritative.

How do you use time to time?

If you do something from time to time, you do it occasionally but not regularly. Her daughters visited him from time to time when he was bedridden.

When should a sentence be hyphenated?

Generally, you need the hyphen only if the two words are functioning together as an adjective before the noun they're describing. If the noun comes first, leave the hyphen out.