If you need to figure out how many users haven't completed their account activation, you can pull this data from the Training Leaderboard export which lists all users and their status:

• Enabled: Users who received the invitation email and have activated their account
• Invited: Users who received the invitation email but haven't activated their account yet

Step 1 

Go to Metrics in the top menu, then choose Training 

Step 2 

Scroll down to Developer Leaderboard

Step 3 

Click the Export Leaderboard button

Step 4 

You'll receive a confirmation message that the CSV file is being generated and will be emailed when it's ready.

From the export file, you can sort by status (Enabled, Disabled, Invited, Read-Only) to see which of your users are pending activation and check the invitation date.

For more details, please see this article Developer Leaderboard Export

Helpful links:

• Reporting in Secure Code Warrior
• Guide to Management Metrics and Statistics