Your original question was, when do you send them back? I usually wait until a fortnight before closing date, not to see if others answer online but rather if sent months ahead I fear they could get hidden under a pile of paperwork.
As for asking, I see no problem if the date is looming and someone needs help with a couple, but we do see some asking half of more from one quiz when the date is far off, can see no pleasure in that myself.
Glad to read that quizzing is helping after a traumatic time, sure keeps the brainbox ticking over.
Mamya (self confessed quizaholic of 20 at least per month)