My old Turbo 2 could, in fact, sleep for a month in airplane mode (with crappy apps removed). However that would quickly drop to about a week with light usage,

My old Turbo 2 could, in fact, sleep for a month in airplane mode (with crappy apps removed). However that would quickly drop to about a week with light usage, e.g. connecting to WiFi somewhere to get directions or pull email for the day.