Hi
There is no limit.
The only limit is the number of items which get archived per-archive run and per user.
Seems like you have got archiving for 3 days, as 200 is the standard limit, I believe.
You have 3 options:
1. Wait some more days
2. Run a manual archive, and select more items per pass or all items
-> In the VAC, right click on -> Directory on <computer> -> <site> -> Enterprise Vault Servers -> <server> -> Tasks -> Exchange Mailbox Archiving Task for <server> and choose "Run Now", then select the options you want
3. Adjust the "Maximum number of items per target per pass" setting, on the same location, but choose properties instead of "Run Now", and click Settings.
Also, check your schedule of the archive run, that it has enough time to archive. (On an average server, you should get ~2 GB per hour as an estimate - of course this depends on your environment and can be higher/lower)
Cheers