Unlike most hand-held or shoe-mount flashes, the duration of studio strobes tends to be fairly slow. While a Metz or Sunpak or similar usually sports 1/10,000th of a second or shorter second flash durations, studio strobes can range from 1/250th to 1/500th to 1/10000th of a second depending on brand, model, power setting, and how many heads are attached to a pack. That's not a serious issue for portraiture, but it can be for dealing with dancers or fast-moving objects. If you need your flash to stop action, be sure to check out this attribute.
Some typical rates are listed here.
Note that some systems use T=0.5 (the duration between when 50% of maximum light intensity is reached to when it has decayed to 50% of its maximum intensity.), while others use t=0.1 (the duration in which 90% of the max intensity is reached then decayed to.) T=0.1 is closer to being a shutter speed equivalent, but neither is exactly equivalent.
Also note that this is a short table. Some units have highly variable durations depending on power levels, number of heads attached, etc., and the combinations aren't all the same: some are shorter with more heads; some are not. Some are shorter with different power levels; others are not.
|Concept B3 / Z4 heads||Pack
|Concept P4 / Z4 heads||Pack||6400||1/1500|
|Grafit A2||Pack||1600||1/250 - 1/6000
|Grafit A4||Pack||3200||1/125 - 1/6000
|Primo||Pack||3200||1/80 - 1/230|
|Chic 1, Mini-A head||Pack||1200||1/2200|
|Chic 1, Mini-A head||Pack||2400||1/1100|
|Chic 1, Mini-S head||Pack||1200||1/1200|
|Chic 1, Mini-S head||Pack||2400||1/600|
|Digital 3000 AS||Pack||3000||1/450|
|Prolinca 125 S||Mono||125||1/2750|
|Prolinca 250 S||Mono||250||1/2000|
|Prolinca 400 S||Mono||400||1/1750|
|Prolinca 500 S||Mono||500||1/2600|
|VP2400 w/4 heads||Pack||100||1/11840|
|VP2400 w/4 heads||Pack||200||1/10240|
White Lightning: <http://www.white-lightning.com/>
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