Editorial analysis
An observation window is not a failure time
The A2 Ultra row records a manufacturer claim of operation without an anomaly through the stated validation window. It is treated as a censored observation because no failure time is reported. Assigning failure at the end of that window would change its meaning.
One record cannot characterize a fleet
The table lacks a set of independent sessions with comparable tasks, software versions and stopping rules. It therefore cannot estimate how reliability varies across robots or operating conditions. The published duration alone is not a mean time between failures.
Define intervention before collecting more sessions
A reliability study should decide whether remote help, a reset, a missed task or a hardware repair ends a session. Record exposure and reasons for stopping consistently. Only then can completed and censored sessions support a meaningful survival analysis.