beep test with configurable distance

[Slam]

The standard beep test is for runs between points set 20 metres apart. I'd like to do something similar in my garden during this isolation period but my garden isn't that long.
Is there an app/program that allows you to set a distance and have it revise the beep timings accordingly?

 

[Slam]

thank you for all the suggestions. gosh I'm unfit! I'm doing the 15m beep test from spotify over a distance of 11m, on bumpy garden lawn. much easier than it should be and yet I can manage just 5 minutes oh well, gotta start somewhere

 

[Slam]

2 weeks on and I can now manage another level, that's 6m 5s of the beep test. Nice to have achieved something tangible