So, i want to do a SNES Speedrun just for fun, not for times or so, but how do i get the Time for it, because ist the actual Hardware, i have a hting to capture Video from it but how do i set a timer or so. sry for bad english

or can i just say how fast i was, like in the Desc.

Timers would be recorded along with the capture stream from your game console, though you should ask in your specific game's forum to see if the video requires a timer. Many moderators can retime runs themselves.