며칠은

for a few days

→ 며칠
phrase Rare #19,826
for a few days 며칠 means “a few days” or “several days”; 은 marks it as the topic or adds emphasis, so the exact sense depends on the sentence.
KO: 며칠은 집에서 쉬어야 해요.
EN: I need to rest at home for a few days.

“며칠은 기다려야 한다는 말 인가요?”

So, are you saying I’ll have to wait a few days?

처음 며칠은 걸어 다니면 안 되나요?

Is it okay to not walk around for the first few days?

— 자전거 도둑 (1948)

며칠은 필요해요.

It’ll take a few days.