There’s an older thread here where they talk about this and using Focus that I thought was helpful, especially post number 4 from @ManofSteele
Follow XATA with free ride alongside
In his next post in the same thread, he mentions
simply keep the fat data-field RED
as something else you can do which I like a bit better than just staying at LTP on a long ride.
I’ve been using this on my long rides and then applying the 50% of Focus time for intervals on days with a Focus <20:00.