Related: Until what time in the morning may you eat on a fast day?

There are different opinions about exactly when one must start fasting. For someone planning to wake up to eat, all agree that they must conclude eating before alot hashachar, but there are differences about exactly when that is. For example, some say 90 minutes before sunrise, others 72, others 16.1 degrees of the sun, and it seems like some also say 60 minutes.

If someone's minhag is, say, 72 minutes, are they allowed to b'dieved (after-the-fact) use the 60-minute time?

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    I don't really know what you are expecting out of this. Ask your rabbi if he holds 72 as a chumra or me-ikkar hadin. Why would you expect there is a general rule? – Double AA Jan 1 '15 at 3:37
  • Related: judaism.stackexchange.com/q/44204 – msh210 Jan 1 '15 at 8:56
  • Minhag? You (as per your CLOR) either pasken that day break is like one opinion or the other. Sounds like "Halocho" not "Minhag" – Danny Schoemann Jan 1 '15 at 11:40

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