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Mission Critical Voice (MCV) QoE measurement methods are being developed by NIST/PSCR to determine levels of key performance indicators (KPI) and to provide fair comparison mechanisms for Push To Talk (PTT) technologies. Mouth-to-ear (M2E) latency and end-to-end access time measurement methods and test results were discussed at previous stakeholder’s meeting. Building upon that foundation, NIST/PSCR has further developed the measurement method to quantify end-to-end access time of P25 LMR technologies using encryption as well as LTE PTT technologies. The end-to-end access time measurement method will be demonstrated.