How frequently should usability testing be performed with users, and for how long? Select one: A. weekly for a full day B. monthly for half a day C. daily for half a day D. monthly for a full day

B

Explanation:

All the other answers are either too frequent or provide a long testing usability time for no reason. If you were to publish a digital product the only real testing time needed is half a day or less. To prevent spam, once a month would also be applicable.