"Full-time" should be hyphenated when used as an adjective or adverb:
"Field" is not hyphenated.
Yes it should be hyphenated.
No it shouldn't be hyphenated.
It should be hyphenated.
No it shouldn't be hyphenated. It is one word.
It should be hyphenated.
Yes it should be hyphenated.
It should be hyphenated.
No it's not hyphenated: biweekly.
No it doesn't need to be hyphenated.
Yes, open-ended should be hyphenated
The second word should not be capitalized