How to calculate endurance usage

I am trying to figure out how long it will take for me to run out of endurance for my super secret dark/shield build but I cannot figure how for the life of me the calculations behind them. I've search high and low for a thread specifically for it but alas even my search fu has its bounds .

I will be using Smite > MG -> SL -> Smite -> SM as my attack chain and currently I have an end rec of 3.64 end/s and end use 1.52 end/s

Thanks for the enlightenment

Santo

Add the endurance each attack uses, divide the sum by the time it takes you to run through your attack chain, subtract your net recovery (end rec - end use) to the number you got, use the result as a divisor to your max end ; that final number is the amount of seconds it takes you to run out of end.

T = total time it takes to execute your chain in seconds (factoring in things like arcanatime)
E = total endurance used by your chain (factoring in how much endurance reduction you have in each power) in units of endurance
R = total recovery in end/sec (subtracting out things like toggles using up your endurance)

Net = R - E/T

If this is negative you will eventually run out.

It of course gets more complicated with Hasten, Dark Consumption, Conserve Power and so on. I'd think in terms of taking the Hasten crash, then needing to make it to the next Dark Consumption or Conserve Power. On the other hand, I'd probably calculate Dark Consumption as if I only had one target, so it wouldn't fill you to full. It might be good enough to time average its contribution in that case and just try to get from one Conserve Power to the next. That's assuming Conserve Power gets you back to full, which isn't always the case either. And it might be better to assume worst case scenario on Dark Consumption timing in relationship to Conserve Power. If you have the Panacea proc, that one has its own calculation. If you want the cardiac alpha, everything gets even uglier.