I've been trying really hard to max out battery life since getting the 7a a couple weeks ago (not using it when I can do the same thing on my PC) and the best I can do is roughly 20-25% battery usage a day. I only charge to 80-90%.
I use instagram and twitter through browser, so vanadium, camera, and maps are usually what takes up most of my battery. I keep Location and Bluetooth off until I need them.
At night I switch on data saver and battery saver (or airplane mode), i still lose about 2-4% overnight mostly depending on what Google Play Services does at like 3am lol. Updating apps, I guess.
My previous phone was Xperia 10 iv, which only perk was phenomenal battery life. I could get away with not charging for days, but that was with standard android.
SOT for me says 17 hr 30 min, but probably bc I never leave it plugged in and stop charging as soon as it's 80-90%.