The valve check interval is, in fact, 6k miles.
Factory also calls it an "Annual or 6k"... which is redundant and virtually meaningless.
BUT, never fear the 6k thing... after break in is complete- at about 18k miles you seldom find that the valves "need" attention. I know many who never do it after the 18 or 24k.
Now, having said that... should we assume that your fear is derived from not owning an RT previously and also thinking that a dealer must be involved?
If this is the case,, I have great news for you. You can do it yourself, it will actually bear no cost at all, and you will increase your ownership experience tremendously...
Get the RT. We will help with the rest.