c'mon, i know that it could mean an onsight attempt, one year of training and so on for 8 tries and 8 years, but they're not talking about me, they're talking about ondra. i think 8 tries could be three days for him, as he generally rests one or even two hours between attempts.
i don't think the "how many days" could make it clearer. the clearest could be "x tries over x days" with maybe how many tries each day.
and anyway, even 8 tries over 8 years would be an amazing effort, in terms of memory and perfect planification.