[amibroker] TWS API "Req Mkt Data" - Any Limitation?

[ShortFox <theshortfox@xxxxxxxxx>]

Hello,

 Does anybody know what is the limitation on calling TWS's API function "Req
Mkt Data"?
I don't need historical data, only real-time (or roughly real-time) data for
as much symbols as possible, retrieved once in five minute or so.
Is there any limitation?

Thanks,
Short.

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