I have a distance of 1.80m (centre to centre of the legs) for my 2.0m tabletop and have had no problems with it so far. That's already 10 cm more than the description says. A little more is probably possible, about 1.90m I would guess.
The feet are 10cm wide, so that would give a gap of 1.80m.
I wouldn't recommend more than that, unless you were to screw the frame together even more.