All planes are tested and certified to evacuate a full load of pax in 90 seconds using only half of the cabin doors.
So it could have been done easy on the LHS only.
But as has already been stated, this test is done with "passengers" not stopping to block the aisles whilst they unload the overhead bins to claim all their cr*p, and .... they were 'staff ' loaded for this purpose, so they were pre-warned AND there was no fire for the test.
Has anyone knowledge of a genuine total emergency bring completed in the required 90 secs ?
Just sayin'.