The HX9V has 30 minute limit. I'm pretty sure all of them do.
Edited to add: just read your comments about 720P, The HX9V doesn't do 720p to my knowledge. from the manual.
Signal format:
For 1080/50i, 1080/50p:
PAL color, CCIR standards HDTV
1080/50i specification
For 1080/60i, 1080/60p:
NTSC color, EIA standards HDTV
1080/60i specification
File format:
Still images: JPEG (DCF Ver. 2.0,
Exif Ver. 2.3, MPF Baseline)
compliant, DPOF compatible
3D still images: MPO (MPF
Extended (Disparity Image))
compliant
Movies (AVCHD view):
AVCHD format-compliant
(1080 60p or 50p/Original
standard)
Video: MPEG-4 AVC/H.264
Audio: Dolby Digital 2ch,
equipped with Dolby Digital Stereo
Creator
• Manufactured under license from
Dolby Laboratories.
Movies (MP4 view):
MP4 format
Video: MPEG-4 AVC/H.264
Audio: MPEG-4 AAC-LC 2ch