When does the next train come?
いつ終わるか分かりません。
I don't know when it will end.
normal times; ordinary days
Dated use meaning ordinary or usual times. It is not the normal modern way to say this; modern Japanese would usually use expressions such as 普段 or 平素.
古い文章では、「いつ」が「普通の日々」を指すことがある。
In old writing, いつ can refer to ordinary days.
When is the meeting?
I don't know when he will come.
No matter when I ask, I get the same answer.
いつ is a general question word for 'when', whereas 何年 narrows the question to a specific year or number of years.
someday; one day; sometime
always; all the time · anytime; whenever
forever; for good; indefinitely; as long as one likes
sooner or later; in due time; eventually
how long; until when
when (emphatic)
before one knows it; unnoticed; unawares
unusual; uncharacteristic; unlike one's usual self
unusually; uncharacteristically
more than usual