Traveled for 20 days and did not touch the tank for the first week after. I have a very low tech setup, apart from the auto doser and a battery backup enough for 4 hours, the rest are a bunch of timers and mechanical float valves with big enough fresh water reservoir for 14 days in winter.
I found it much better than I expected it to be, corals are a bit bigger and happy, and all fishes are there, except for an issue with calcium level due to a mistake from me, nothing went bad and i seem to have made it on time before this affected anything. I had someone feed the tank every day and fill up the reservoir once and clean the glass once.
the skimmer was not cleaned and only emptied with a turkey baster. was too yucky for them. getting a cleaning head will be my next item and i think i will be able to go for about 40 days with this setup.
I was monitoring it for a few minutes every day with a 360 webcam so i could see both sump and display.