ORIGINAL: Allfat
That depends on what glow charger you have. I bought one and charged it up and took it out for the first day of flying, used it all day. Then a day later, I went out again and did not charge the glow driver during the night because I figured it would last a long time. It died after a couple of starts of the engine and I had to borrow for the rest of the day. I plug my glow charger in after every time I go flying.
That is good to know. I just recently got a rechargeable glow driver. I used to use one of those real cheap ones that used D-cells, and a D-cell would last me about half the summer. I figured the rechargeable would be good for several weeks at least. I'll have to check it before my next trip to the field.
Thanks