Media Encoder JPEG to H.264

I am currently trying to convert multiple JPEG files into H.264 formats using Media Encoder, and it's working quite well. However, I have the problem that the length is limited to 5 seconds. I can shorten it, but I can't extend it to, for example, 15 seconds. I could simply export it in Premiere, but since I have several JPEG files that I want to export as individual H.264 files, does anyone have an idea on how to achieve this?

Best