Consecutive fasts? 2 x 10 day, rather than 1 x 20 day??

Hi there,
I am really keen to do a 20 day fast, but have only managed 4 or 5 days so far, which is largely down to boredom and difficulty with motivation. Physically, it's a challenge, but mentally I just really struggle- 20 days seems like forever, and I feel so overwhelmed that I just give up and self-sabotage.
I'm wondering if there is equal benefit in doing 2 x 10 day fasts, with 4 or 5 days in between. This would seem more manageable. However, I'd like to hear if anybody has ever done anything similar, or if it is a good idea. I realise that Id be giving myself the hellish first few days twice, which might be foolish (especially in terms of losing muscle), and I dont know what the effect would be on my weight. Any feedback would be really helpful. Also, if I were to do this, what would be the best eating plan for those few days? Sticking to carb-free stuff to try and keep up (partial) ketosis, or juicing/raw veg to cram in lots of nutrients?
Generally, is there a big difference between doing one longer fast, or two shorter ones?
Many thanks!