Would ballpark timing in the 100's of % be fine ?
Thats what you get with 555 timers over T and V and Bulk cap tolerances.
Datasheet very misleading as it shows its timing with a relatively small cap,
.1 uF, not a bulk electolytic type cap whose intial tolerance can be in the
100's of % tolerance at room T.
But I suppose one can always throw in a pot to adjust for these difficulties.
Even worse with logic gate based timing, where threshold varies dramatically.
Add that to bulk cap tolerance and you have a system that may or not blink in
your lifetime.....
Regards, Dana.