Would take a lot, but you have to classify exactly what a single flight is. With glow, you're looking at 9 to 10 minutes, whereas witht he li poly's you get about 1/2 hour flight time with an electric,..i.e. 3 times a glow. It takes a bit over an hour to charge. You charge constant current at 1C rate till you reach 4.2V per cell, then hold that voltage and start dropping current till current reaches zero. They reach 4.2V per cell in about 45~50 minutes and they're about 95% charged at that point. It takes another 1/2 hour to 45 minutes with the current tapering off to get the other 5% in. I generally fly when they reach 4.2V per cell. I figure I'm not going to fly 1/2 hour continuously, but more like 10~12 minutes like anyone else (I've actually sat at our field on sundays and timed people, other than the few exceptions, average flight time is 8 minutes with the glow guys and we have a very large club, 30~40 guys there on a sunday, so it's a good representation). li-poly charge times are lengthy, but what I've found is that I normally fly a 10~12 minute flight, sometimes extending that to 15 minutes (timer start at takeoff roll and stop on wheels down). I can plug in to the charger and "top off" the pack in 30 minutes, but fly whenever I really want to cause there's another 15 minutes or so worth of time in the pack after I land,..i.e. I don't really have to wait on charge to finish. li poly's are different from nicad or nimh. There is no memory, and they actually prefer to be charged to 90~95 percent, then discharged partially (not all the way down, can't go below 2.5V per cell or damage occurrs), so they actually suit the normal style of flying far better than nicad/nimh. They can also be charged, and sit for literally weeks before flown, with no noticable degredation in performance,..i.e., they don't have to be flown "hot" off the charger. I fly quite a few 10-cell planes (or 3series/4 parallel 8200 thunder power lipo's,.. they're same size as 40-size glow planes), and I keep 3 pakcs charged. If I want to go fly after work for instance, I always have 3 packs ready (hour and a half of flight time, about 7 to 9 equiv. glow flights). sometimes I don't even take a charger to the field since I have plenty of flight time available with those packs. for F3A, you would use 9S4P, or 10S4P (10 series, 4 parallel is what's in the rhapsodies for Jason), so that would be 30 minutes of flight time roughly,.. available without charging, or 3 practice patterns per charge.Since the normal routine at the field is to fly, then BS with the guys 15~20 minutes,..then repeat, you can actually charge during the normal downtimes and fly as much, or more, than glow. Sorry for the long dissertaion,..but with the long flights now available with electric compared to glow, you can't really compare in number of flights flown since electric flight time is about 3 times glow flight time per charge/fueling.