How long is the delivery to reach destination?

It depends on how priority is the thing.

How is the priority works?

If !, it means not so priority so it might takes 5 to 7 days to delivery. If !!, it might takes 2-4 days. For !!!, it is the most priority so it will delivery in one day depends on what time u want. But we still hope that everyone could understand the meaning of priority by using it wisely.

Is there any time limit for the most priority delivery or 24 hours?

Ya. The delivery will stop after 11pm. So any order after 11pm will be moved to next day 7am.