I think what Kilrah means is that there's a lot of variables that we don't have in order to complete the equation for you.
Do you mean TB47's or TB48's
Do you discharge to 30% or to 10%
What kind of temperatures are you working in (a hot battery won't charge till it cools down, and so cold climates can charge again sooner).
I can tell you what I find with my system, which differs from yours massively in that I have dual 180w chargers. But you can use it as a rough guide.
I have 4x TB48's and 1x TB47.
I use 2x 180w chargers.
It's around 12-15 minutes flight time from each TB48 battery and probably about 12mins max from the TB47.
I live in a relatively cool climate, and we're also coming out of winter, so the cool down times are only a matter of minutes and often less.
So assuming a rotation time of 18 minutes per battery.
Assume you start flying at 00:00 hours:
Battery 1 will be flat and be on charger at 00:18 (ready at 01:48)
Battery 2 will be flat and be on charger at 00:36 (ready at 2:06)
Battery 3 will be flat - but you're out of chargers - at 00:54
Battery 4 will be flat - and still no chargers available - at 01:12
Battery 5 will be flat - and no chargers available - at 01:30
with my 5 batteries I'm now dead in the water after just an hour and a half.
Assuming I add one more battery.
Battery 6 will be flat at around 01:48 ... just as the first charger finishes charging, and battery 3 will now go on in its place.
But I still couldn't loop them, even though I finished my last one just as my first one became ready again, because....
Battery 1 will now be in use again and flat at 2:06, just as the second charger finishes.
Battery 2 will now be in use again and flat at 2:24, but battery 3 will not be finished charging until 3:18.
I now have around 54 minutes till battery 3 is done. I'm still way short of looping them perpetually.
So 6 batteries and 2 high wattage chargers, with precision switch overs, would still only get you till about 2:24 before you'll come unstuck and have to wait.
In theory it will only work if you have 6 chargers.
So my answer is that you need 6x high wattage chargers, and 6x TB48's to loop perpetually.