i would say that the limit to consider is not on RT number but on the VRF max number. Even supposing you need to implement centralised sevices, it is going to be very challenging for any platform to manage so many RT per VRF on a single router. Please post your design so to beter answer to your question. By the way, don't forget that configuring so many RT on a single platform is never a good idea for the single point of failure issues before than for the router performances.
For example instead of importing 50 route-targets is more appropriate to have those other 50 VRFs to export with an additional route-target and then to have a single VRF import in the VRF that should receive the routes using that specific additional route-target.
There is also the capability to use export-map and import-map to invoke route-maps in order to perform more granular import or export.
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