I did some test with the DDP export and compared it with the same project that was rendered in WaveLab and CD Architect. Here's the results shown in Sonoris DDP Player. The pause times in all three was set at 2 seconds. Reaper is off 1 digit compared to the other two. Is this because Reaper doesn't have CD Frames?
WaveLab
CD Architect
Reaper
Same results show with a Reaper Cue/Bin