The ambassadors from Norway, my good lord, Are joyfully returned.

Cornelius and Voltemand work fast, I guess!
Or else this gives us a clue as to how much time has passed since the Ghost turned up and shook Hamlet up. Has someone done this math?
How long would it take to travel from Denmark to Norway and back at the time this play is meant to take place? And, by the way, are there any clues as to when this play was meant to take place? Or should we ask how long it would take to travel from Denmark to Norway and back when Shakespeare wrote the play? Whatever those numbers may be or might have been, we’d need to add at least a day, probably two, to allow for ambassadorial activities – ceremonies, meeting with royalty – let’s say they weren’t rushed right in to see old Norway – we’re talking a couple days at least. Probably more like a week. Even by today’s speedy traveling standards, while it might be possible to travel it all in a day – it’s highly likely that the job would take 2 or 3. And when does this gap in time happen? It seems so far, we have:
Day 1 – Horatio sees the Ghost. Sun comes up.
Leading into
Day 2 – King’s big speech. Horatio reports ghost to Hamlet who watches for it into the night. We could call this one continuous day.
Day 2?Day 3? – Does Laertes leave immediately or does it take some time to pack his stuff and make arrangements? Does Hamlet put on his antic disposition right away? Is this little scene with Ophelia in her sewing closet right after the ghost or does he take some time to work up to high amp madness? He must take some time because Ophelia had to refuse his letters and lock him out already. . .not something right away, right? The King and Queen need a few days to take in the madness and send for Rosencrantz and Guildenstern, who in turn need some time to arrive. . .so I can see how a week could go by between sending Cornelius and Voltemand off to Norway and receiving them again.
There are some lost days here in the middle. What happened?