I don't do the Best Buy so I can't give feedback on that.
The ty "monthly" and "biweekly" visits are for how often that store is visited.
For example, a Casey's gas station might have a merchandiser go visit one time per month.
A different store, like Walgreens or CVS might have someone visit two times per month. You can do the first visit, the second visit, or both.
These aren't really audits either. They're merchandising projects and the time invested can vary widely for different reasons - some stores, it might take a while to hunt down the manager. Another store might have 2 or 3 displays that have to be re-stocked. Some stores might have a lot of inventory to count.
Hope that helps!