三四个
sān sì gè
Approximating with sequential numbers
Two consecutive numbers side by side give an approximate range.
Number 1 + Number 2 + Measure Word
How it works
三四个人 is three or four people; 一两天 is a day or two. No "or" is needed.
The numbers must be consecutive and ascending. 三五个 is an exception that means "a few".
For bigger ranges: 十几个 (ten-something), 几十个 (dozens).
Examples
sān sì gè rén
三四个人
three or four people
yì liǎng tiān jiù hǎo le
一两天就好了。
It'll be ready in a day or two.
wǒ děng le qī bā fēn zhōng
我等了七八分钟。
I waited seven or eight minutes.