You can only stay in the Express Entry pool for one year from the date you were accepted into it.
Your Express Entry profile will expire if you are not invited to apply in those 12 months. If it expires, your profile will be removed from the system and you will get a message in your MyCIC telling you so.
If your profile is about to expire, you can save screen shots of (or print out) your profile to make it easier to re-enter your data. Do not create a new profile until your existing one expires. You can create a new profile at any time once yours expires.
If you decide to create and submit a new profile before your existing one expires, you will need to withdraw your existing profile first.
Check this link http://www.cic.gc.ca/english/immigrate/skilled/no-invite.asp
I think you are able to renew your profile, just sign up again to enter the pool. If you want to be really sure just send Ontario an email or call them and ask them if you are okay to just re make your profile when it expires, just make sure your points do not go below 400.
Also, please note to intimate OINP about the new profile. You will have to send the following information to OINP.
1. The Express Entry number/job seeker validation code for your new profile;
2. A copy of the letter you have received from Citizenship and Immigration Canada acknowledging the new profile; and
3. A letter explaining why you created a new profile and a list of the additional or updated information you provided in your new Express Entry profile.
You can only stay in the Express Entry pool for one year from the date you were accepted into it.
Your Express Entry profile will expire if you are not invited to apply in those 12 months. If it expires, your profile will be removed from the system and you will get a message in your MyCIC telling you so.
If your profile is about to expire, you can save screen shots of (or print out) your profile to make it easier to re-enter your data. Do not create a new profile until your existing one expires. You can create a new profile at any time once yours expires.
If you decide to create and submit a new profile before your existing one expires, you will need to withdraw your existing profile first.
Check this link http://www.cic.gc.ca/english/immigrate/skilled/no-invite.asp