after 6pm of any Friday until 9am of the following Monday

[uktous]

Hi,

Question:
Which sentence is correct?

Sentence1:
Nobody will stay in our office after 6pm of any Friday until 9am of the following Monday.

Sentence2:
Nobody will stay in our office after 6pm on any Friday until 9am on the following Monday.

Sentence3:
Nobody will stay in our office after 6pm of Friday until 9am of the following Monday.

Sentence4:
Nobody will stay in our office after 6pm on Friday until 9am on the following Monday.

Thanks

[Rover_KE]

#4 is correct, but change stay to be.

Rover

[tedtmc]

Nobody stays in our office after 6pm on Friday until 9am on the following Monday.

The present tense is appropriate since it is a routine.

not a teacher

[emsr2d2]

I don't like the use of "stay" here. I would prefer "to be".

No-one will be [available] at our offices from 6pm every Friday until 9am the following Monday.

I would actually prefer:

Our offices are unattended from 6pm on Fridays until 9am on Mondays.
or
Our offices are unattended between 6pm on Fridays and 9am on Mondays.