If there is no measurement, or limited enforcement - then I'd bet it's approximately equal to one or two visits. Whenever someone tacks on way more requirement

If there is no measurement, or limited enforcement - then I'd bet it's approximately equal to one or two visits. Whenever someone tacks on way more requirements than could possibly be met, there is a natural prioritization. If after 5 years you didn't deliver on the core idea - then the NSF probably won't care that you completed all of the k-12 outreach. If you hit the research objectives out of the park, then they are going to demand you max out the k-12 outreach.