In fact the focusing distance depends on the diopter power of your close-up filter. For the case of stacking 2 +5, it's like +10. This means it's like focal length of 1/10 m, -> 10cm, which will focus object at 10cm away, if your lens is focusing at infinity. The distance will be slightly shorter if your lens focusing at nearest.
If you use only 1 +5, the focusing distance will be about 20cm.
Raynox 250 is a +8. So focusing at around 12cm.
I still have problem carrying my filter always. In fact not the filter, but the whole camera set. haha!