I know it's not Friday, but tomorrow I will leave my country to go to France and I'll be offline for a while...
Burn one image on multiple devices. More info here:
time cat raspi.img.gz | tee >(split -a 3 -d -b 100M --verbose - ~/trash/TT >&2) | gzip -cd | tee >(sudo dd of=/dev/sda) | sudo dd of=/dev/sdb
See you in a few days!