My TacT 2.2X stays on 24/7*, as well as the BAT VK-D5, even though it uses 6 Siemens CCa’s. That’s: unless there’s a storm on the horizon, or I’ll be away for awhile.
*Both have Standby features, that reduce the current levels to their circuitry. BAT's Standby keeps a much reduced level, to the tubes, compared to it's circuitry (NICE, but: I'm still glad those CCa’s have a 10K hr life expectancy).
Digital stuff just takes forever to reach quality sound, from a cold start, in my experience.