I allow 1 hour for a complete re-build from all the parts dismantled and cleaned. This 1 hour includes:
1) Dil and O2 bottle fills
2) Scrubber fill
3) inspect parts, lube & assemble
4) unit checks and calibration
5) pack, ready for journey to boat.

This is for my Sports KISS and my procedure/routine has resulted in zero dives lost due to unit failure in over 100 hours use.

I think the fact that the unit is so simple and easy to tear down / set up allows every major component to be cleaned, inspected and prepared before every dive day in a very efficient manner.

For tear down / clean it takes me about 20 mins. This includes full anti-bac cleaning. I do this every dive day.

Maybe I take too long & do too much, but it works for me.