What's the longest time that two people in a long distance relationship can go without seeing each other in your experience?

Anonymous
I am in a long distance relationship with my boyfriend of two years. We generally try and see each other every three to four months, but the last time we met was in December, 2015 and there is no chance of seeing each other again until July, 2016. This will be the longest we will go without seeing each other and it's killing me. If any of you have been in a LDR, what's the longest you guys have gone without seeing your SO and how was the experience. How did you deal with it? Detailed answers are welcome.
What's the longest time that two people in a long distance relationship can go without seeing each other in your experience?
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