The timing for certification and evaluation of N95 masks can vary depending on the agency, process and application volume. The following is a general time range, but please note that this is only a rough reference:

1. NIOSH certification:

The NIOSH certification process typically takes several months. This includes multiple steps including submitting an application, conducting lab testing, evaluation and review. The exact timing depends on the complexity of the request, the availability of testing resources, and NIOSH's current workload.

2. European CE certification:

The timing of CE certification can vary depending on the certification body and product complexity. Typically, applicants need to conduct product testing and document review and ensure that they meet the requirements of the EN149 standard. The entire certification process can take several months.

3. China certification:

The certification process in China usually takes a shorter time. The specific time depends on the efficiency of the certification body and the number of applications. Typically, the certification process can take anywhere from a few weeks to a few months.

It should be noted that the above time is only a general reference and the actual time may change due to various factors. Additionally, for vendors that are already certified, they may have a faster certification renewal process.

If you plan to apply for N95 mask certification, it is recommended to contact the relevant certification agency in advance to understand the specific time requirements and procedures.