[a4000]

The Shinkansen runs the fastest Nozomi service about every ten minutes throughout the day at around 5 trains per hour on the most popular routes like Tokyo to Osaka, then during peak hours there's another 5 added in on top of that as well. Plus there are some other slower, cheaper services that run as well and some trains will be express an others stop at more stops or go to further destinations and so on.

I think altogether they probably come to one train every 3 minutes during peak times, but they are not all the same trains and don't all go to the same place and stop at the same stops. There is generally about one train every 10 minutes per platform at a station in my experience, but of course there are usually well over 20 platforms per big station, it's not like there is one platform with a train stopping every three minutes.

[lmm]

> The Shinkansen runs the fastest Nozomi service about every ten minutes throughout the day at around 5 trains per hour on the most popular routes like Tokyo to Osaka, then during peak hours there's another 5 added in on top of that as well.

Your numbers are out of date. The current timetable is 16 trains per hour per direction (12 Nozomi and 4 slower services that stop at more stations) on a single line - some go further than others but they're all going to the same places at least as far as Nagoya (and all but one go to Osaka).

> There is generally about one train every 10 minutes per platform at a station in my experience, but of course there are usually well over 20 platforms per big station, it's not like there is one platform with a train stopping every three minutes.

The stations have multiple platform faces connected to the same line, even intermediate ones, but in general it's a two-track line, one up, one down.