I have a 29 gal and spend maybe 1 hour per week actually doing work on the tank. A swipe every day or 2 with the mag float, empty the skimmer cup every 3 or 4 days, change floss every other day. I do a 5 gal PWC every week to 10 days, depending on work schedule. I dose a 2 part daily. I feed daily.
Most of these things take a minute or 2 at the most, PWC taking the most time. Between mixing the new water, syphoning of old, removal of chaeto and all the other little thing that go along with it, including the inevitable cleaning up of spills, for me takes 30 or 40 minutes.
Considering the time I sit and look at my tank plus the time I spend on here and talking to other hobbyists, divided by the "work" I put into it plus the cash cost, I still think I come out ahead.
*EDIT* My tank is a biobcube, AIO, so my sump is a simple chamber. I just reach in, remove the chaeto, tear it in half, try to remove the pods for one half then toss pods and half back, and other half to the garbage. My hood is fully enclosed, to be honest, I top off when it makes noise, less than 2 quarts twice a week.
Also canister filters aren't often used in reef tanks, some use them in FO, but I have no experience with them.