The problem is a scheduling problem with n jobs and k machines. Each job i can be started at any time, but its duration is not exactly known except a time span interval. For example, a job may take anything from 5 mins to 10 mins. The list of jobs and their duration interval is given to the scheduler and the aim is to minimize the time all jobs would be finished. In interval scheduling, the job start and end time is given and the length is fixed. Here, the job can start and end anytime (should be done in whole though) but its duration (length) is not exactly known.
I searched the literature for this problem but couldn't find it. Is there any keywords I can use or any reference for this problem? Is it well-defined?