between 7 p.m. until / to / till 10p.m.

At what time does the function start ? The function starts at 7.00 p.m
At what time is the function on ? The function is on from 7.00 pm until 10.00 p.m. till can be used but is informal.
The function is on from 7. p.m to 10.00 p.m.
The function is on betwe

Hi,
At what time does the function start ? Much more common than 'at what time' is simply 'when'.

When does the function start?

Clive

Can I say,

When does the wedding start?

(a) It is between 7.00 and 1.00 p.m. / 7.00p.m. and 1.00 p.m.

Vincent read Anon's post. Everything is there.

Sorry, do you get what I mean?

I'm asking the time (7.00 and 10.00 p.m. or 7.00 p.m. and 10.00 p.m.) '

How about this?

(ii) There will be four hundred in /for the dinner.

(ii) There will be 400 number of guess for dinner.

If you ask "When does it start?" then there is ONE start time: 7 p.m.

If you ask "When is it" you can say "It's from 7 p.m. to 10 p.m."

There will be 400 guests at the dinner.