I fly glow 6 days a week, (only 4 flights a day or so before work). I keep 2 rechargeable ignitors and one alky ignitor in my bag. When one NiCD ignitor goes down I have the second....and I know to charge them both that night. (The alky ignitor is for emergency use only....I have never used it).

I have gone as long as six weeks on a charge with ONE of them. They are rarely on the plug for more than 30 seconds anyway.