i used to turn off my engine during long-ish waits.
i figured, if 30 seconds or more waiting, i turn it off.
so far, after 13 years and over 124K km, ok naman engine.
but i had to replace my battery more than twice as often as my other car's, whose driver did not turn off the engine during long-ish waits as i did.
I usually turn off my engine during stoplights more than 2 minutes. Tiis tiis lang sa walang aircon :D
When I visited Japan, most ng cars dun hybrid and naka idle stop/start system.
Kapag sa stoplight, madidinig mo halos lahat mag start kapag go na sila hehe.
Kaya okay dun kahit sa city sarap huminga.