Should I use the chronograph as the second time zone time indicator?

Firefly

However, what I concern is that , from a mechanical perspective, would it put a lot more strain on the watch to have the chrono running constantly in this manner? Will this manner make the maintenance interval much more shorter than usual? Will this manner run out the reserved power more quickly?📖📖📖📖

Horlogerie

Running the chrono will not put a lot more strain on the movement, depending on the design, some functions of the chrono actually unload the timekeeping train slightly. Consider that any change in the load (increase or decrease) on the timekeeping train changes the power available at the balance wheel, and any changes in power affect the amplitude of the balance, which in turn effects the timekeeping. So although there is a slight increase in load when the chrono is activated, the design is such as to try and keep the increase to a minimum so as to not effect the timekeeping.

Maintenance intervals don't change if the watch or chrono are used, after 5 years or so the oils have all dried up and lost their effectiveness and need to be removed and replenished.

As already mentioned, run time, power reserve, is a fixed quantity, it's not like fuel in a car where if the load increases you burn fuel at a quicker rate, this scenario doesn't apply to a watch. The available torque from the mainspring is not variable, meaning that it can't increase to compensate for a higher load. If you let the chrono run till the watch fully unwinds, when it stops running if you disengage the chrono the train will most times start up again and run for a short while, not enough to be concerned about.

I run my chrono's all the time, day in and day out, unless I am actually timing something like say the soft boiled egg I had just now for breakfast...

Rob