Answer: is

Explanation: When referring to collective measures such as Time, Weight, Length, and Money, they may appear plural but take a singular verb when considered as a single unit. For example: “Five years is the maximum sentence for that offence.”

However, when these measures are understood separately rather than collectively, they take a plural verb. For example: “Ten years have passed since I met you last.”

In this case, since the measure is viewed as a single unit, the correct answer will be singular, “is.”