[JasonB]

I used Google sheets to share accounts when I had a Plumbing business, my business partner had access to full editing rights and meant our accounts were 'live'.

It took quite a while to input the times into my own spreadsheet but I agree, a live up to date timing schedule is not only easily edited as the rounds go by but also highlights possible anomalies.

...I'd prefer the class colours right through each line

How easy is it to give someone editing rights?

As for coloured backgrounds, obviously it's each to their own, but my tired old eyes find that it doesn't aid legibility. But of course that would be a decision for whoever makes the spreadsheet.