on the order of

Adverb

followed by a number often

(often followed by a number) Approximately.

Japanese Meaning

およそ / 約 / 大体

The new battery increases the device's runtime on the order of two hours under normal usage.

新しいバッテリーは通常の使用で端末の稼働時間を約2時間延ばします。

Sense（1）

(often followed by a number) Approximately.

[T]he rough number of mobile phones is on the order of 3 billion.