Here, while you're waiting, are my proposed rewrites:
- The project lasts for six weeks, with [regular*] Saturday seminars
- During my five-week trip to Europe I'll meet a lot of friends
* Almost optional. Without it there could be fewer; but you can judge from the context whether you have to be explicit about this - at any rate '...six...six...' seems to me excessively punctilious!
Student or Learner