Via @CTorp:
averaging 41 mA +12 V and, if you leave out the Safety Valve, 20 mA -12 V (32 mA if you include the Safety Valve). 15 modules in a row would work out to about 600 mA on the + 12 V rail which is at the high end of or a bit beyond the FC spec (~500mA at +/-12V), but it depends which modules of course.