"He spent hours and hours and hours practising these conjuring tricks. It's just such a curious thing"

This quote by Simon Callow talks to the dedication and commitment of the individual he is referring to. It is clear that this individual has put in a great deal of effort and time into improving their craft. The phrase "hours and hours and hours" implies that this individual has been working hard for a long period of time, and using the word "curious" recommends that the speaker is impressed by the dedication and skill of the person. It is likely that the speaker admires the person's effort and devotion, and is fascinated by the truth that they have actually put in a lot effort into something that may not be extensively valued. This quote speaks to the power of dedication and effort, and how it can cause terrific success. It also speaks with the significance of following one's passions, no matter how odd they may be.