英和和英

a 30-day period

a time unit of approximately 30 days

on and after the 30th

It had a run of 30 days

fifty days

twenty days

a month that has 31 days

The play run for 30 days

a short month （of thirty days）

I leave in a few days.

a year less three days

within a seven day time period

It ran for 30 days.

a period of ten days

Revision may be demanded within three days.

a time period of seventy days

a forty day time period

The play ran for 30 days

a period of two or three days

on the tenth day

On the tenth

twenty-one days

a period of one hundred days

for forty days

the twentieth day of a month

How many days?

How long?

the first three days

the 30th wedding anniversary

sent on the 30th.

on and after the 30th

a time unit of approximately 30 days

It had a run of 30 days

at midday

at midday

at midday

within a seven day time period

I leave in a few days.

on the tenth day

a time period of seventy days

in the daytime

On the tenth

It ran for 30 days.

every other day―on alternate days

on Monday

in a week's time

from that day on

a few days

The play run for 30 days

in those days―then

in days gone by

in days gone by

by the week

a period of one hundred days

fifty days

the 30th wedding anniversary

30 staff

a time period of 30 years

a forty day time period

in those days