It rained for a few days.
After several days, a reply finally came.
Several students remained at the venue.
many; many a; again and again
Used before a counter or noun, often with も, to emphasize a large number or repeated occurrence, as in 幾日も or 幾度も.
See also: 幾日も
It kept raining for many days.
I have heard that story many times.
Interrogative prefix asking for a number, amount, distance, time, and so on. In casual modern speech, 何〜 is often more common, but 幾〜 remains useful in set expressions and written style.
See also: 幾日
How many more days will it take to complete?
How many kilograms is this luggage?
I heard the same story many times.
How many nights do you plan to stay?
幾つ is a standalone question word meaning 'how many' or 'how old', while 幾 is the bound prefix used inside forms such as 幾日, 幾度, and 幾久しい.
how many · how old
how much; how many; what amount · something over; and change; -odd · however much; no matter how
as much as one likes; any amount; plenty · almost none; hardly any · no matter how much; regardless of amount
how many times; how often
somewhat; to some extent; a little · some; part; portion
Standard kanji form for this prefix, used before counters, nouns, and in fixed expressions such as 幾日, 幾度, and 幾久しい.
The reading いく functions as a native Japanese numerical/interrogative prefix conventionally written with 幾, a kanji associated with small or uncertain quantities. The exact historical derivation of the Japanese reading is uncertain.
multiple layers; piling up
many months and years; a long passage of time
how many days · what day of the month
many generations; many ages; many years
thousands; many thousands
how many nights · some nights; several nights; a number of nights
number of years; how many years
how many months
how old; what age
a few; some; several
many; much; plenty · hardly any; not many