There is no limit on how many Challenges you can buy or run at the same time.
The limit applies to funded accounts: the combined balance of all your live accounts cannot exceed $200,000. With a maximum account size of $100,000, that means up to two fully sized funded accounts.
The limit covers the funded capital you buy. The Scaling Plan, which grows a single account over time, works separately from it.
All of this applies to accounts held on one profile. Registering a second profile is not permitted.
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