Семь is the subject, and i think numbers are generally grammatically treated as singular neuter
One batch containing seven pieces of something... Okay, I can work with that, thank you.
2,3,4 and numbers ending 2,3 and 4 are followed by the genetive singular. пять and upwards are followed by the genetive plural.
31 - месяц
32 33 34 месяца
That's not really the point here, the question is about нужно, not месяцев.
Oh, I see. Thanks a lot for your reply. My understanding of it is that "I" is not treated as the subject, so another way of phrasing it would be "X is needed by me"? Would this also mean that the sentence doesn't really have a direct object as now "X" would be the subject? Thanks again.