Well, if you read the front page, it tells you it has a max recording time of 2x @ 72Mb per second (hereby refered to as 9MBps, as using Mb for transfer rates is stupid).
If the drive can achieve 9MBps on a 25GB disk (25,000MB), then it would take 46.5 minutes to fully burn one to the brim (25000/9=2777.7777 | 2777.7777/60 = 46.5).
eVGA NF4 SLI mobo
Opteron 165 Dual Core 1MB cache @ 2.5ghz
2GB Mushkin DDR PC4000
2x160GB & 1x250GB 7,200RPM SATA w/NCQ
eVGA Geforce 7900 GTO 512MB PCI-e
Pioneer 111D 16x DVD burner