Result from spin off of Viatris stock.
It runs from your device. If you are on a WiFi connection it probably will be slower than a hardware connection to your router or cable modem.
What broker are you using?
I do thru Fidelity.
Worse case should be 75 calls. That gets you in your 80 call limit. 471 equities x 10 dates per call 741 dates/10 dates per call = 75 calls....
I have a solution that could be adapted for your need, but it is setup for TDA.
What broker or is that open?
Separate names with a comma.