kozavr

Название группы в Скайпе: EFL BBC 6-minute English
Как видно из названия, встречи делаются на основе подкастов BBC 6-minute English
Встречаемся 2 дня в неделю: Среда в 20:00 мск и Воскресенье в 11:00 мск


25th of April (Wednesday) 20:00  Ethical coffee
29th of April (Sunday) 11:00 The future of marriage
2nd of May (Wednesday) 20:00 Should schoolchildren have jobs?
6th of May (Sunday) 11:00 Microadventures!
2nd of May (Wednesday) Pedestrianisation - is it good for cities and towns?
6th of May (Sunday) 11:00 Rise of the machines
9th of May (Wednesday) Swimming like a mermaid
13th of May (Sunday) 11:00 Hello, hello
16th of May (Wednesday)  Robot therapist
20th of May (Sunday) 11:00 Would the world stop without clocks?
23d of May (Wednesday) Laughing could kill you

kozavr

"The class will be over in 10 minutes"
but
"I went to the bar, but I left after 10 minutes"

"in" and "after" both specify a future time relative to the present moment. There's no grammatical rule saying either preposition is correct or wrong - it's just idiomatic preference that most people would use "in".

Given that "in" is a somewhat "metaphoric" usage here, I suspect there's a tendency to only use it in simple constructions where it's relative to the present moment.

When speaking of some situation in the past, there is no "present moment" - so we need to explicitly state the time/event that we're counting our 10 minutes from. In such contexts, we're more likely to use after (or within, following, etc.) because the whole situation is more complex, so we choose our words more carefully.

Also
'After ten minutes' suggests certainly not before ten minutes have passed, and might be quite a bit later. 'In ten minutes' is fairly precise but might mean a little less than ten minutes.