This is difficult to judge, so needs some experimentation. A good starting point is to carry out a 'trial run', where you start behind your camera and then run around your scene, illuminating the objects as you go. Time how long it takes you to do this, and then use that as a starting point for your exposure time.
If you have a lot of light painting to do, you may find that the illuminated areas come out too faint to make an impact. To get around this you'll need to split your scene up into logical areas and take multiple shorter exposures. These can later be combined in a software package like Photoshop, Paint Shop Pro or GIMP. To combine your exposures, stack them on top of each other in separate layers and select 'screen' as the blend mode for each.
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