After you’ve done your darnedest to spot them all (along with one little elf lurking in both illustrations), scroll down to reveal the answers. According to Ciphr, the average time to locate all 10 differences is roughly 4 minutes—which is also about the length of Mariah Carey’s Christmas classic “All I Want for Christmas Is You.” The Queen of Christmas recorded the song in August, but that didn’t stop her from cranking the A/C and covering the studio in holiday decorations to simulate the proper seasonal vibe.