Yes, I do have a master list with dates for all these details.
Mail: We get almost none. My solo trips are typically 6 weeks or less, and my husband is in WA when I go on them. Where we live we have a lockable mail box in a bank of them similar to what you might see for businesses. It wouldn't work for an 8-week trip but I learned that I could extend the 30 day hold time by making the start date 7 days after I leave and checking the option for me to pick up the mail when I return, which allows me to get it up to 10 days after the last day of the hold. So I can have mail held a total of 47 days or a little over 6 weeks.
Bills: Everything is already on autopay, either by credit card, debit card or direct draft from my checking account. If some stray one-off bill turns up by mail, it can just wait until I get home.
Water: With our natural landscape we don’t water anything. I turn the water off at the house (not at the street). I also turn off the water supply hoses to the washer, hot water recirculation pump and and the water softener. I flush all the toilets, making sure that they refill and don't keep running.
Exterior services: The company that sprays the exterior of the house for insect control and the area within about 50 feet of the house for weed/fire control continues to do so quarterly whether we're home or not.
Sheriff: I use the service the county sheriff's office provides to check on the house occasionally while we're gone.
Key: I leave a key with friends in the neighborhood, list them as my contacts with the sheriff, keep up with them while I'm gone and hope that they're home if anything happens.
Alarm system: I set our alarm system. Due to our lack of decent nearby wi-fi or data access, it doesn't connect to any service, but it's very loud so anyone who tries to break in as well as neighbors within a half mile will know something's amiss.
Curtains: Our curtains are closed, but with the shears we have it's hard to tell if they're closed or open.
Interior lights: Our normal night lights stay on. I set up lights on timers in different rooms to go on and off at different times. Those light changes can be seen around the curtains and through any glass that doesn’t have curtains.
AC: I set it at a high number (about 90) if it's hot (most of the year) and a low one (about 50) if it's not.
Fans: I turn off the ceiling fans we have in every room regardless of season.
Electricity: I leave the power on primarily for the fridge and freezer and the alarm, but also for the AC system.
Gas: We have a gas cook top, heat and hot water heater. I leave the gas on because of the complications of turning it off and back on.
Dog: The dog goes to Camp Bow Wow, the absolute best place I've ever boarded a dog.
Packing: No matter how long I'm gone, I coordinate everything (usually around a scarf I love), layer, pack for a week and do laundry along the way. I wear everything (except underwear) 2-3 times before washing it or having it washed for me. Last summer I traveled for 5 weeks. My laundry methods included doing it myself (sink, laundromat) or having it done for me by a service.
I limit my 2-wheeled carry-on to 20 pounds and wear my heaviest clothes on the plane. I can get all that can go in the plane's overhead bins in a 22×14x9, 42L or smaller bag which I carry-on. I use compression cubes to keep my clothes organized. My basic exterior wardrobe includes the "coordination scarf," 6-8 tops, 3 pairs of pants, 2 pairs of shoes, 3 pairs of socks and 1 rain jacket. Underwear, other outerwear or sleepwear may change due to the weather. I choose my plane clothes from those garments. My personal item goes at my feet and holds the hard to replace essentials required for the flight and for the trip like meds and electronics.