Can I talk to her as long as I want?

Yes, in the sense that matters: there is no limit you will meet by talking to her, because that is where most of the real material comes from. Only the quests are capped, at 30 answers a day, and the sparks at 12. There are technical ceilings behind that, and we would rather name them than let you discover one: a single message holds 2000 characters — room for a long story, not for a pasted file — and something that reads like a screenshot of code or a log is turned away rather than answered badly. The rest is set far above any real conversation, so you reach it by hammering the service and not by living with it.