15-second spot
From DigitalJargonBuster
A popular advertising slot and duration for television commercials.
The growth of online TV has created new opportunities for running traditional broadcast commercials through new platforms. These might reach a new audience, or the same audience that has switched from traditional television viewing to online. The durations of web commercials are still evolving, but the standard formats for broadcast will certainly continue online.
See also: Pre-roll, Mid-roll, End-roll, 30-second spot