1 minute per shingle to primer + 1 coat of paint = 2 minutes per shingle
about 1000 shingles per house side x 4 sides = about 4000 shingles
another 1000 for the front dormer
10000 minutes of painting time required for entire house (or 167 hours!)
.... and that doesn't include sorting/resizing, installation, or the second coat of paint required once hung.
No wonder the neighbors think I'm nuts! But they do appreciate the asthetic improvement.