It's not unexpected or unusual to have bursts of inactivity in the Guide being updated like this. But in my experience this process will eventually "self-correct" and the ongoing true Guide update will resume and you'll once again eventually have 11 days worth of live data.
Computer type PC/Desktop System Manufacturer/Model Number Home-built, two systems (1) and (2) OS Windows 7 Pro x64 (1), Win7 Pro X64 (2) CPU i5-3350p 3.1Ghz/6MB-cache (1); E8400 3.0Ghz/6MB-cache (2) Motherboard ASUS P8Z77-V Pro (1); ASUS P5Q3 (2) Memory 8GB PC3-12800 DDR3 (1); 4GB PC3-10600 DDR3 (2) Graphics Card ATI HD7750 (1), (see TV cards); ATI R7 250 (2) Sound Card Realtek ALC892 HD Audio (1); Realtek ALC1200 HD Audio (2) Monitor(s) Displays Eizo HD2441W LCD, Eizo S2433W (1); Eizo 24" S2433W (2) Screen Resolution 1920x1200, 1920x1200 (1); 1920x1200 (2) Keyboard IBM PS/2 (1) and (2) Mouse Logitech MX Revolution wireless (1); Microsoft wired (2) PSU Nesteq ECS-6001 600W (1); Nesteq ECS-5001 500W (2) Case Acousti-Case 360 (1) and (2) Cooling Noctua NH-U12P SE2 for CPU, 2x120mm case fans (1) and (2) Hard Drives (1) 1TB SATA-II (7200RPM), 2x2TB SATA-III (7200RPM), 250GB SATA-III (10000RPM) for OS; 2x2TB external USB 3.0 (2) 320GB SATA-II (7200RPM), 750GB SATA-II (7200RPM), 150GB SATA-II (10000RPM) for OS; 2TB external USB 3.0 Internet Speed 100mbps down / 10mbps up Antivirus Microsoft Security Essentials; Malwarebyte Anti-Malware Pro Browser Firefox Other Info Ceton Infini TV 4-tuner cablecard-enabled TV card as well as Hauppauge HVR-2250 OTA/ATSC 2-tuner TV card in (1), running under Win7 WMC It's theoretically updated twice a day, at least by the automatically scheduled task that Windows runs.
If you haven't done this or are unsure please go to My Account and select your region and time zone and then click "update".
For Windows 8 Pro and 8.1 Pro if you don't already have Media Center installed you will need to download and install Microsoft's Windows Media Center Pack for your Windows version.
If your Windows 8 or 8.1 version is not the Pro version you will need to upgrade to Windows 8.1 Pro via Microsoft's Windows 8.1 Pro Pack...
Though WMC does not need to be running, if the services are disabled and WMC is unable to automatically update EPG data, XBMC will either display a blank EPG or CRASH when selecting 'Live TV'.
Please ensure you can view live TV from within WMC before continuing!