Sort:  

Unfortunately, "Hourglass" isn't the official answer. Two clues are available in the comments and in the post.

I would appreciate your feedback. Do you think that this rebus was too open for alternative solutions and that the official answer (published here) isn't any stronger than the alternative answers published in the comments? Thanks!

Little tricky in it's simplicity but makes perfect sense. Pretty good.

Thanks for the feedback! 🙂

This answer is officially recognized as an alternative solution and rewarded with 0.25 SBD.
I hope you'll participate in my new contest:
https://steemit.com/crackthecode/@barcisz/crack-the-code-1-contest-with-sbd-to-win