All the given times follow 3PM but they can also precede 3PM. To determine if a time follows or precedes a given time you must know the day or date of both times. That is, 3PM tomorrow comes after 3PM today, but 3PM yesterday precedes 3PM today.
It doesn't matter what country you are in. All the given times can follow 3PM, but they can also precede 3PM. To determine if a time comes before or after a given time you also need a day or date as a frame of reference. That is, 3PM tomorrow follows 3PM today, but 3PM yesterday precedes 3PM today.
3pm
3pm EST is 9pm CET. Central European Time (CET) is 6 hours ahead of Eastern Standard Time (EST).
The correct sentence is 'I will come home at 3pm'.
3:01pm comes after 3pm.
All of them. 3PM is 24 hours later than 3PM. However, without a frame of reference (a date) all of them could also be regarded as being earlier than 3PM. That is, 9PM last night would be earlier than 3PM today.
3pm to 10pm is 7 hours.
24 of course !
In any 24 hour period, all times from 3:01PM to 11:59PM come after 3PM. All times from 12AM (midnight) to 2:59AM come before 3PM. Without the 24 hour constriction, all times can come before or after 3PM. To determine one way or the other, you must also specify a day or date. That is, 3PM yesterday came before 3PM today, but 3PM tomorrow follows 3PM today. By the same token, 12AM tomorrow (midnight tonight) comes after 3PM today, while 12PM (noon today) comes before 3PM today.
If it is 3pm in Adelaide, it is 3:30pm in Melbourne.
It would be 74 hours from 3pm on Monday to 5pm:24 hours from Monday 3pm to Tuesday 3pm24 hours from Tuesday 3pm to Wednesday 3pm24 hours from Wednesday 3pm to Thursday 3pm2 hours from Thursday 3pm to Thursday 5pm