Amount of pruning, scape design etc influences this(gardening),
This has Nothing to do with a water change however
Water change itself should take just a couple of minutes in actual labor/time.
For small tanks, the bucket and drain is a minute or two with a good sized siphon hose.
For larger tanks, a DIY hose with a U shape PVC "hook", adapter to the bath/shower just takes set up time for the drain and then refill.
During that time when you wait, gardening etc can be done.
But the water change itself is still only 2-3 min of labor to add the hose and start the siphon/refill.
Most of the labor is cleaning filters, trimming, gardening etc.
Total labor per week for my 180 Gal, 120 Gal, 2 x 60 Cubes and the 20 ADA is about 2 hours.
Total weekly time for a 350 Gal of a client's : 1.5 hours.
Regards,
Tom Barr