GL journal approval workflow Customization

Hi Experts,

We have a requirement where the journal approval workflow for Oracle Genera Ledger needs to be modified to accomadate below:

1) To send notification to the approver every day till the journal is approved for first 100 days.

2) After 100 days if journal not approved then workflow need to terminate.

3) In the first 100 days if journal approved by 1st approver then worlflow needs to go to 2nd approver if required and again to send notification every day for 100 days.

Clarifiactions:

1)How much code change required to accompalish this.

2)Do we need to modify the existing journal approval workflow or create a custom one.