Fasting to completion is a very different experience for each individual and at each stage of a persons life.
I dont approach with fear or caution but do reccomend that a journey like that could benefit from supervision and guidance x I have fasted for 3 weeks max without and it can be a wonderful challenging journey x
Fear is a hurdle to overcome and if you have someone looking out for you that may help you to complete, other peoples experiences always help / good or bad.
There may be people here that have fasted to completion unsupervised but they dont seem to be answerin ur questions.
There is a lot of info on this matter rawfoodexplained.com is great x
I have understood that the body gives yu clear signs when it is time to end, your breath and tongue clear up and are sweet and there is a return of real hunger, an experience that s persistent and very clear x