Did mine in 1, and would advise 100% against it. If things start to go badly early on, you can develop a very negative mindset, and the whole thing can get very stressful, with an increased likelihood of errors and failure.
My logbook reads 2hrs 20 mins for the Test. For me, the first half of the Nav was great, then I really did badly on the diversion (only saved by recognizing a landmark and realizing I was way off course, and fixing that pretty late in the diversion). However, that really knocked my confidence, and I can remember making stupid errors in the GFT, culminating in my first ever go-around after a god-awful glide approach. This was stuff that was never an issue in training, and which I put down to the accumulating stress over the long Test. While I passed, I would not knowingly put myself through that again.
Just MHO