By ArM5 p. 107 The Experimental Premise experiments are per season, affect the Lab Total once, and cause one roll on the Extraordinary Results Chart per season. So you can only get one Discovery result on that roll per season, too.
If you did work on several effects during a season resulting in a Discovery, AFAICS it is not clear whether the Magnitude of your Discovery is that of one effect only (and who does pick it), or the combined magnitudes of all the effects worked on in that season.
Best discuss and decide within the troupe before a magus tries this.
Cheers