Read the dialog and answer the question.

Andi: Heni, do you know how to make batik?

Heni: No, I don't. Can you?

Andi: Yes, come here. Let me show you how to make batik.

Heni: Great!

Andi: You need to prepare the tools and wax.

Heni: What is this?

Andi: Oh, this is called canting. It is used to wax batik after you sketch the pattern using charcoal. The canting is filled with molten wax to trace along the pattern. You need to be careful because the molten wax is very hot and may burn your skin. You have to pour it as soon as possible to avoid it from hardening.

Heni: I see. What if I make a mistake?

Andi: It will be really hard or even impossible to fix it. So, you must make a sketch before and wax it carefully.

Heni: You're right. By the way, how long does it take to finish a large batik cloth?

Andi: It depends on the difficulties of the patterns. Batik is processed several times to reveal its colors. It can take two weeks or even more.

Heni: Wow, that is a long time! Anyway, you look so skillful in waxing the batik. Can I have a try?

Andi: Sure. You can consider this cloth as your canvas.

Heni: All right. Thank you, Andi.

Andi: You're welcome.

Why does Heni need to be quick in waxing batik?