Although expensive, it can last up to 2 months. And that's because it is very powerful. You warm a small amount in your hand, apply it to your hair, style it as you like, and that's it. It lasts at least 2 days (obviously, you have to wash your hair at some point). On the second day, a blow dryer is enough and the hair is styled again without any additional product.
Now, onto the negatives... It doesn't come off easily from the hair. Not at all. It may not leave marks, but it leaves a feeling. And it's quite annoying because you never feel your hair clean. It takes at least 3 washes without intermediate use to completely remove it. Also, if you don't warm it with the blow dryer, it doesn't spread easily at all.
The reason I used it for a while and gave it this rating is because it is the only product I have tried all these years that was effective in styling and had lasting hold throughout the day. If you can't handle the negatives I mentioned, it's better to choose something else