I decided this weekend to see how many of my fleet of 37 ships I could upgrade to engineered SCO drives.
Having a fleet carrier made things a lot easier. I already had a shipyard installed, so I added T3 ship propulsion stock, which allowed me to install SCO drives on all my ships without going anywhere. The old FSDs also automatically stored on the FC. I'll hang on to them for a bit.
Next was engineering. I found I already had the materials on hand to fully G5 two FSDs. Then I ran out of DWEs. It had been a while since I needed a distribution centre and it took a while to find one - in the Ch'iang Fei system. Then I found the 0E wake scanner in my usual "mission runner" didn't have quite the range for easy scanning, so I bought a 0D and fully engineered that. 5.5km is the perfect range. Then I spent about 3 hours scanning wakes and occasionally leaving to trade up full data bins.
The end result from all that was 18 ships with fully G5'd SCO drives and 19 G4'd. By far the most amount of time was spent ferrying ships between the engineer base and my FC in orbit above it in order to apply the experimental effect to all 37. I reckon I spent about 4-5 hours flying back and forth.
Hitting the SCO to get to orbit is a hoot! Leave it on a little too long and you end up many Ls away!
In summary, I don't consider what I did a "grind". I chose to upgrade my entire fleet all at once and I think it unreasonable to expect that such an undertaking should be anything other than a grind. After all, I could have just settled on the immediate upgrade to my two most-used ships and left the others for later.