I would bet you probably come up with a really good idea about once a week, and that's being conservative.
The trick is just to store them in some always-accessible note taking app (e.g. Evernote, OneNote, Apple's Notes app) as soon as they come to you (i.e. in the middle of a totally unrelated lecture), and accumulate them over a long period of time (talking years here).
The trick is just to store them in some always-accessible note taking app (e.g. Evernote, OneNote, Apple's Notes app) as soon as they come to you (i.e. in the middle of a totally unrelated lecture), and accumulate them over a long period of time (talking years here).