"You cannot go back further than 10 days for intra-day trading ... period.
Yeah, I know this sounds weired, but it's true. There's a rumor that if you have an account with Ameritrade you can boost it up to 20 days, but I cannot substantiate that."
Yes, I can substantiate that.
If you have an account at TD Ameritrade or Ameritrade-iZone, with minimum of $2000, you can get RT streaming charts for the last 20 days.