Final answer:
The minimum number of MRs spot checked for an LPO in 3-M PMS should be conducted at regular intervals, such as weekly, bi-weekly, or monthly.
Step-by-step explanation:
For 3-M PMS spot checks, the minimum number of MRs spot checked for an LPO should be conducted at specific intervals. The exact intervals may vary depending on company policies, but typically, these spot checks should be conducted on a regular basis, such as weekly, bi-weekly, or monthly. The purpose of these spot checks is to ensure that the LPOs are meeting the required standards and delivering high-quality work.