Allow setting custom talk durations for e.g. workshops.
Allow setting custom talk durations for e.g. workshops.

malemburg/epcon,EuroPython/epcon,artcz/epcon,malemburg/epcon,malemburg/epcon,EuroPython/epcon,malemburg/epcon,malemburg/epcon,EuroPython/epcon,artcz/epcon,artcz/epcon,EuroPython/epcon,artcz/epcon,artcz/epcon,artcz/epcon,malemburg/epcon