Just use your lens cap and half-press the shutter release button to see the shutter times on the LCD or in case of your X20 the OVF.Some of the limit are because the camera is in a semi automated setting, eg P mode. mine appears to have the 30 second limit in all modes, though I couldn't test it out fully because of the light
I got 30 secs in A, S and M mode and 4 seconds in P mode that way.Just use your lens cap and half-press the shutter release button to see the shutter times on the LCD or in case of your X20 the OVF.
With any available ISO?I got 30 secs in A, S and M mode and 4 seconds in P mode that way.