The good news for those companies that have not done so is that getting regular usability tests running is extremely beneficial and not that much of a hassle.
Here is the thing, though - it is not that much time, and it is not that much money. Most organizations simply do not know, however, that usability testing can be both lean and efficient.
Running a test with 4-5 people three times will catch more issues than running it with a large group once. This sample group is usually just enough to find the worst issues, and using this sequence will help companies find more of the worst issues.
As a result, the findings (i.e., a video of the user) of a test should be circulated to project managers, designers, analysts and anyone in the marketing team who can spare a few hours a month to see what works and does not work on a site. Marketers will ultimately get more from usability tests, essentially, if they can get more people to watch the tests.
In other words, digital teams should not let the current state of their site stop them from engaging in usability testing.
There is really no one accepted cadence for running usability tests. The idea, though, is that marketers run them on scheduled intervals. If they have a small team, they can start with once every two months, and adjust from there. Running tests regularly - rather than every time there is a major project - has several benefits. Schedules of major projects, for example, cannot derail when tests are conducted, and once key stakeholders start to associate dates with usability tests, those responsible will get more people to attend.
Using the techniques above will be more effective than a 50-page slide deck that no one will read, and will keep things actionable instead.