Is there a formal version of the term "until," used in the context of "The event will run from 8 a.m. until," signifying an indeterminate end time?
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You can reword the phrase a few ways to imply no end (or an indeterminate end):
You can also insert a phrase after until:
Across different days:
Yes - the standard form in formal invitations is, "8 a.m. till."
Note that "'til" is a possibility, but less formal than the much-older "till."
EDIT #2: I gave a bad answer, I apologize. I just checked again my dictionary and if you don't have a specified end time then you can use this way:
Previous answer: My Dictionary says that till is less formal than until:
Another source confirmed that till is less formal than until.
EDIT: Sorry for the edit, but I found another entry. From the OALD (Oxford Advanced Learner's Dictionary):