If the latest technology for Wire Production is to be considered, the OCC replacement Copper PC Triple Wire will be a Wire to consider.
The Cat is Out of the Bag and there is a steady growing movement toward this Wire at a commercial and enthusiast user level.
As far as I know SAEC are the only company at present offering this wire used as an internal Wand Wire, and there is also the possibility this wire used is PC Triple C / EX, which has a forged High Purity Silver Sheath on the Copper Core. The EX is the same wire I am working with, the goal is to separate the strands and produce a Insulated Internal Wand Wire, the Sheathing Method for adding the Insulation, is being worked out between a few friends at present, using much cheaper strands of wire. The ease of the process, ensuring the Wire is not stressed and the Overall Wire Diameter as an end product are presenting there own challenges.
As for Burn In times for a Phonostage, a reverse riaa adaptor used in conjunction with a CDP will enable endless hours of Phonostage use, and save the Cartridge.
If a Valve Phon' is in use, do the same method, but swap out the chosen Valves for cheaper options to preserve the life of the preferred valves. This is my preferred method and have put a few hundred hours on a New Phon' in quite short periods of time, having the music on low level and within hearing range will reveal noticeable changes to the SQ as the burn in progresses.