$t1 = microtime(true);

.....

if ($t2 = microtime(true)) {
    Jx_Log_Logger::addInfo('time', [$t2 - $t1]);
    $t1 = $t2;
}

......

if ($t2 = microtime(true)) {
    Jx_Log_Logger::addInfo('time', [$t2 - $t1]);
    $t1 = $t2;
}