还不到

less than; not yet

→ 还
phrase Rare #28,435
less than; not yet Used before a quantity or time period to say that it has not reached that amount or duration.
CH: 离开会还不到十分钟。
EN: There are less than ten minutes until the meeting.

还不到一个时辰案子就破了

The case was solved in less than two hours.

— 满江红 (2023)

一天还不到

It hasn't even been a day.

— 流浪地球 (2019)