for months; many months
Emphasizes a long duration of multiple months, often with a sense of 'for months on end' or 'for many months'. Used adverbially.
He was hospitalized for many months.
This problem hasn't been resolved for months.
Variant using the small-ka counter ヵ; less common but still seen.
Spelling using the full-size kana か; acceptable but may be confused with the question word 何か月 (how many months).
Combination of 何 (how many) + counter ヶ月 (months) + particle も (as many as). The ヶ is a simplified form of the kanji 箇, used as a generic counter.