Guide Time intervals (1 Viewer)

[evolution2]

MediaPortal Version: 1.0.2.0
MediaPortal Skin: Bleazlewide
Windows Version: XP pro Sp3
CPU Type: Intel Core 2 Duo 2.4ghz
HDD: 500GB & 750GB
Memory: 2GB
Motherboard: Gigabyte GA-73PVM-SH2
Video Card: On board NVIDIA
1. TV Card: Haupauge NOVA S plus
1. TV Card Type: DVB-S
1. TV Card Driver:
2. TV Card: Haupauge PVR-150
2. TV Card Type:
Cooling: Golden Orb II
Power Supply:
Remote: MCE
TV: Sony 40" LCD
TV - HTPC Connection: HDMI

How can the time scale along the top of the Guide display be changed?
My lounge HTPC used to be in 15min sections, then somehow changed to be in 30min blocks
Bedroom PC has always been 30min sections.

Since reinstalling lounge PC the display is now in 1hour blocks and is very cramped
How can I changed this to 30min blocks?


Thanks
Brendon