You can have up to 5 funded accounts active at the same time, with the following limits per product type:
EOD / Sprint Challenge — up to 5 funded accounts.
Instant Funded — up to 3 funded accounts.
You can combine both — for example, 3 Instant Funded and 2 Challenge funded accounts to reach the 5-account cap.
There is no limit on the number of evaluation accounts you can purchase.