A Matter of Time is the debut mixtape by American singer-songwriter Mike Posner.

The mixtape features the Brain Trust which includes underground rappers Big Sean, Donnis, Jackie Chain, and singer Eric Holljes.

"Smoke & Drive" featuring Big Sean, Donnis, and Jackie Chain was another single from the mixtape.

The music video for the song featured Dominican model Rosa Acosta and was shot on the Duke University campus where Posner attended.

[5] "A Matter of Time" was in the top number one position of the iTunesU, which is for free lectures by professors.