RealBand will go way over 255 limit.
But the funny thing is it's Biab that generates up the tracks for it (bbw2.exe) it will also generate up tracks with decimal point tempo maps (as Biab will round the tempos down 110.573 > 110 then have the next bar at 111).
This was 384 bars with 5 tracks 600meg so as Biab generates the tracks direct to RAM this would not be an issue.
The Biab plugin has the same problem and should be fixed soon with a new save format rather than .SGU just like ReaBand has .SEQ it will save more than 255 bars and will save decimal point tempo map.