Fx.

$progress->start($output, 5000);
for($i = 0; $i < 5000; $i++) {
   sleep(5);
   $progress->advance();
}

When the progress has counted the first 2-3 elements it would be nice to have a estimated time left after the percent in the console.

 62/5000 [====>---------------------]  63% 1h20min