Fix timing last two episodes

[klieret]

#8 doubled the timing on what is now the last two episodes

[michmx]

Actually, I would say all chapters will require some adjustment after the plans that we have for extension (for example, examples with sci-hep).

[stale]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.