In Ontario, Canada a new driver must hold a G1 licence for a minimum of 12 months before attempting the G1 road test but the level 1 license is valid for up to 5 years. To move up to level 2 or G2 status you must pass a road test.
Your G1 or G2 license will expire 5 years after you received your original G1 licence. If you have not passed the G1 and G2 road tests and earned a full G license by within 5 years you will have to need to redo the knowledge test to get a G1 and/or retake the G1 road test to get your G2.
According to the Ontario Ministry of Transportation (MTO), your Level One (G1) novice licence or Level Two (G2) for Ontario, Canada will expire if you do not exit the Graduated Licensing Program within 5 years after you obtained it.
The MTO states that to keep your driving privileges, you can take the appropriate road test to graduate to the next level of licence, example, take Level One road test to graduate to Level Two, or Level Two road test to graduate to a full class licence. If not, your licence will expire and you will have to take the knowledge test to re-qualify for Level One, or take Level One road test to re-qualify for Level Two.
You can contact the MTO for more information about their graduated licensing program but it appears that you need to move up to your G2 and then full license before 5 years have elapsed from the time you received your original G1 novice license or it will expire.
Get a Canadian car insurance here with us once you have your Canadian driver's license.