I was reading through the description of warding in SR 4 and wondered how many mages it would take to ward one of the megacorp's base buildings. As I am far too lazy to look up the volume of the Renraku arcology, I decided to go for a modern example that would fit about the right size template, the Empire state building.

Turns out that it is just over 1,000,000 cubic meters.

Now, a single mage can ward (magic * 50) cubic meters. On average one would expect mages hired for warding to have a magic attribute of 5 (actually, probably less, but I can't be arsed to do the math for more complex numbers). 250 cubic meters. Not to worry, though they can summon a spirit each to help them, force 5, for an extra 250 cubic meters each. Watchers are impractical, as for a decent level warding they are either not going to last long enough, or knock out the caster. Let us assume the mages summon the spirits in seperate locations to avoid the empire state building racking up a huge background count. That gives 1,000,000/500 = 2000 Mages. I reckon a megacorp could get 2000 mages togther.

let's say they want a force 5 ward. That's 5 hours work for 2000 mages at 100 nuyen an hour. A million Nuyen. Pocket change for a megacorp. Even if you factor in an extra 500 nuyen each transport and accomodation costs, and an extra 100 nuyen each per hour for the spirits, it's a steal at 3 million.

Now the fun part, 4000 warding rolls (don't forget the spirits). We will assume that all the mages apart from the lead mage are saving edge to avoid glitching, as only a critical glitch would influence the final roll any.

The helping mages all have the impressive willpower and magic ratings of 5 Each, as do the summoned spirits, for 10 dice each. call it 9 for dice lost to normal glitches reduced from criticals, (spirits will have been ordered not to glitch). Then 3 of those dice, on average, wil be hits.

There are 3999 entities rolling for 11,997 extra dice on the lead mage's roll.

The lead mage then rolls 12,007 dice, and adds edge to the roll beforehand the mage is human (to explain the high edge), and has 5 edge. He rolls 12,012 dice, rerolling 6's

4004 hits on the first roll,

2002 extra dice to roll

667 hits on 2nd reroll

333 extra dice

110 hits on the 3rd reroll

55 extra dice

18 hits on the 4th reroll

9 extra dice

3 hits on the 5th reroll

1 extra dice, that does not hit.

that's 4802 hits.

The bulding will be warded for just over 92 years. So they won't have to do that again in a hurry.

Now who can get the most accurate value for the amount of time one would expect the Empire State building to remain warded should the minimum number of mages required to do so attempt this massive feat?