I heard the spawn rate was 36 hours for a leftie from friends, but after killing one, and coming back 35 hours, 50 minutes before, i waited 25 minutes and found nothing. There were no bombs in the map, so nothing was hindering the spawnage.
I went on to track another pianus, and it wasnt 36 hours either.
What is the actual spawn rate for a leftie? And does it vary at all (ie mushmom)