I follow a [s]nutter[/s] exploring cyclist who is currently riding the Silk Road - I'd love to see his way so far as a continuous route, but I don't know how to do this through Strava. I've see this on TrackLogs.
If you follow them then click on their name at the top of a recent activity of theirs and you'll get to their public activity page. Click on any of the bars in the graph near the top and you'll see that week's activities.
I don't know of a way in Strava to display activities stitched together, not been able to do it for my own multi-day stuff.
Veloviewer will allow you to show a wheel for a month (e.g.) activity. Don't know how to do that with Strava.
http://www.jonathanokeeffe.com/strava/map.php
you can set ranges on this but I can only make it work for me, not other riders.
This would be useful for me too. A [s]nutter[/s] mate of mine recently did the great divide and it would be good to see it as one journey on strava.