No, the term "long gone" is not hyphenated. It is typically used as two separate words to describe something that has been absent or missing for a considerable time. Hyphenation is generally unnecessary in this context.
The word desperate hyphenated
The word "self-confidence" is hyphenated.
Light-Headed is a hyphenated word.
No, "hardworking" is not hyphenated.
The word "gone" has a long 'o' sound.
Left-handed is a hyphenated compound.
Both the full word and the hyphenated form are accepted.
"Field" is not hyphenated.
Yes it should be hyphenated.
No, "homework" shouldn't be hyphenated.
No it shouldn't be hyphenated.
There shouldn't be any spaces in a hyphenated word.