Are you saying that your therapist thinks this is a good idea? To what end, may I ask? Because really, at least to me, it does not seem all that clear what you mean by "immersion." You have titled the OP as "168 hours of womanhood." So does this mean that it is your intent to attempt to experience "womanhood" by dropping several thousand dollars on some super expensive services and products that many women would steer clear of?
If it is your intent to satisfy some crossdressing fantasy that you have, then by all means - have an absolute blast and enjoy yourself!!!
But if it is your intent to experience life as a "woman," this is *not* the way to do it.
And unless you identify as a mtf transsexual, which I cannot imagine you do given the substance of your post, why would you want to do that in the first place? It just doesn't make any sense. Unless, of course, it relates to the aforementioned fantasy, which there is absolutely nothing wrong with if that's your thing . . . .
Still, if this is what your therapist has signed off on, I would have some pretty serious concerns about the competency and background of your therapist. Unless you and your wife are one of the very fortunate few to have gobs and gobs of money to just throw away or spend without a care in the world, this seems like a horribly irresponsible idea to me, and one based completely upon fantasy . . . .