how many months
Used to ask about a duration or number of months. Often followed by particles like も or か.
How many months have you been in Japan?
How many months will this project take?
Asks 'how many years' instead of months.
Asks 'how many days' or 'what day of the month'.
Standard and most common spelling using the small ke (ヶ) counter.
Variant using the small ka (ヵ) counter; less common but still encountered.
Spelling using the full-size hiragana か; sometimes used in informal writing.
Compound of 何 (nan, 'what') + ヶ (ka, counter for months) + 月 (getsu, 'month'). The ヶ is a simplified form of the kanji 箇.