I am wanting to convey this sentence:

This year marks the end of the 4 year long 'Environmental Protection Victoria' project.

I have looked online to no avail, can anyone tell me if '4 year long' in this context is grammatically correct? Or if an alternate such as '4 year-long' or '4 yearlong' is better? The sites I've checked online all refer to yearlong (singular), but I'm wondering if the spelling is different when we're talking about multiple years. Thanks.

closed as off-topic by Drew, Nathaniel, Marv Mills, TimLymington, Hugh Dec 10 '15 at 0:29

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In this case, it would be "4 year-long." If the sentence was along the lines of "The 'Environmental Protection Victoria' project was four years long," it wouldn't be hyphenated.

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