yes, as several means more than one and "month" will need to be plural.
The Apollo 11 mission was launched and completed in July 1969, after several months in preparation and several years in planning. It's not really correct to say that it 'happened'.
Mr. Holograve said that he spent several months in Barcelona during his travels.
Mr. Holgrave had spent several months in a community of Fourierists.
Yes, "several people" is correct grammar. "Several" is an adjective that can be used to show an unspecified small number of people.
The correct spelling is "months."
8 Months....No longer than 9....12 is way too long.
correct way to say it is: "I will schedule a meeting at 10:30."
It is not grammatically correct, no. The word is homework. "I have a lot of homework." or "I have homework in several classes."
It is not correct because the verb "reached" requires an object. As such, it should be phrased "You would have reached it two months ago" or, in place of the it, you can use any other noun or pronoun as an object.
The correct phrase is "six months." When referring to a duration of time, "months" should be plural to indicate more than one month. Therefore, you would say, "It has been six months since the event."
It stays not started for several months.
The correct grammar is "You have been here for four months."