How long is too long (hairloss worries)?

I just completed 7 days of MC, am planning to go for as long as I can manage. Last year I did a 10 day Water Fast and a 12 day MC. Also, the first week of this one went without any hardship worth mentioning and I feel better and better by the day, so I'm aiming for the maximum of 40.

However, as I was reading the forum I found a post by the great Somer where she mentions she started losing a lot of hair after one of her longer fasts. In normal circumstances I wouldn't worry about it happening to me, I know it's normal and I know it will grow back. My hair is really long now though, and should I lose a lot of it, I'd have to cut it and spend years growing it again. Vain as that is, I'd rather not have to.

My current plan is doing as many days as Somer and the rest of you say are 'safe' for my hair and then applying Somer's "10 days Master-Cleanse -- 10 days cleansing diet" rotation until I reach a total of 40 or 50 Master-Cleanse days. Could you let me know if that sounds adequate at all and could you suggest how long is too long for one's hair?