In all honesty that job should have taken an hour, that's set up and pack away time included.
Heres how I would have done it.
Ladder with stand off, two 25 litre water barrels against ladder feet.
place end of gutter vac in hand proceed to walk up ladder so you slighty above the gutter.
Vac to you right vac to you left.
Move ladder one more time, job done and complete on front.
Repeat on back