Sitzfleisch

To have sitzfleisch means the ability to sit still for the long periods of time required to be truly productive; it means the stamina to work through a difficult situation and see a project through to the end.

"I’ve seen it translated as ‘endurance,’ but I think the best thing is to say ‘to have staying power’- i.e., that you are able to sit in one place for an extended period of time,” explains Paul Joyce, a senior lecturer in German at Portsmouth University in the UK.