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fixed time

Posted: Fri Feb 28, 2020 8:04 am
by azz
a. Volunteer work at our school isn't for a fixed time. You work as long as you want when you come here.
b. Volunteer work at our school isn't a fixed time. You work as long as you want when you come here.
c. Volunteer work at our school doesn't have a fixed time. You work as long as you want when you come here.

d. Volunteer work at our school isn't for a fixed length of time. You work as long as you want when you come here.
e. Volunteer work at our school doesn't have a fixed length of time. You work as long as you want when you come here.



Which are grammatically correct?
Which are natural?

Many thanks