Interpolating between two FRotator in a given time

I’d like to interpolate between 2 orientiations in a given time (something like “rotate from (0, 0, 0) to (0, 90, 0) in 10 seconds”).

I know that an RInterpTo() function is available, but it takes a speed instead of a given time. I can’t manage to understand how to convert the time to a speed. What’s the trick? I know it should be simple, but I can’t figure it out…

Implementation seems to apply DeltaTime * InterpSpeed, so if InterpSpeed is 1, it should do the full interpolation in 1 second. So set InterpSpeed = 1.f / (YourRequiredInterpolationTime). To cater for Time Dilation I think you’ll need to additionally multiply this value by the Time Dilation factor as well.