The speaker isn't contrasting amounts/portions of work: the portion I did vs the portions the others did/the rest of the work (the diagram on the right) or this portion of my work vs the rest of my work (the diagram in the middle).
The amount of work I did is huge = I did a lot of things.
Last edited by Alexey86; 10-May-2020 at 23:15.
Not a teacher or native speaker
Okay, I see. I'd overlooked the lack of the definite article.
Yes, that all makes good sense then.