JLPT N3 · Degree & extent

数量（すうりょう） + は (suuryou + wa)

数量＋は — “at least (amount)”

In short · When the particle は follows an amount (time, number, quantity), it means “at least that much.” The speaker feels the actual amount is that or more. It is usually followed by verbs like かかる, ある, 入る.

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Pattern

数量（＋助数詞）＋は＋かかる／ある／V amount + は = at least that much (三日は, 百人は, 一週間は)

Where it comes from

Here は is the particle of contrast. Putting は on an amount points to that amount as a minimum line: “that much, at the very least (and maybe more).” Nothing special is added to the number itself: 三日は, 百人は.

How it is used

It is often used with expressions of time needed (かかる), capacity (入れる) or existence (ある), and with guess forms such as だろう and そうだ. It is a natural estimate, not an exact count.

Difference from 以上

三日以上 is a plain, objective “three days or more.” 三日は carries the speaker's feeling or judgment, such as “it'll take three days, I'm sure.”

Examples

この仕事（しごと）は三日（みっか）はかかります。

Kono shigoto wa mikka wa kakarimasu.

This work will take at least three days.
この会場（かいじょう）には、百人（ひゃくにん）は入（はい）れるだろう。

Kono kaijō ni wa, hyakunin wa haireru darō.

This venue can hold at least a hundred people.
完成（かんせい）までに、あと一週間（いっしゅうかん）はかかりそうだ。

Kansei made ni, ato isshūkan wa kakarisō da.

It looks like it will take at least another week to finish.

Common mistakes

は goes right after the amount. Do not use it for an exact or fixed number: 「ちょうど三日は」 sounds wrong.
It expresses a minimum guess. To say the opposite (at most), use ～しか or ～まで instead.

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