The free trial period may vary depending on your country and equipment level, but it always lasts at least 12 months. The service period is linked to your vehicle and displayed in your user account. After the free trial period is over, you need to renew in order to keep enjoying the service.
See below for details regarding subscription fees and duration:
SEAT CONNECT for Radio (Safety & Service and Remote Access functionalities).  1-year subscription: 50€ or 2-year subscription: 85€
SEAT CONNECT for Navi (Safety & Service, Remote Access, Online Infotainment and Infotainment Apps*). 1-year subscription: 135€ or 2-year subscription: 225€
SEAT CONNECT for Radio (Safety & Service and Remote Access functionalities).  1-year subscription: 50€ or 2-year subscription: 85€
SEAT CONNECT for Navi (Safety & Service, Remote Access, Online Infotainment and Infotainment Apps).