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Depends on what your issue is. I've had tickets open for several months (before I ended up closing them again myself).
User reports take several months (if they get resolved at all), reroll requests are granted pretty quickly within a couple of days usually though.

it took me like more than a week, when a guy view giveaway key but did not mark as received on a giveaway

Maybe about of importance and times. For example i created a ticket and they answered in 30 minutes

It depends on what you sent, so it's unclear if it will be processed immediately.
Wait 1 minute.
Or you'll have to wait about two weeks.
(In the normal case. Things that need scrutiny can take a very long time.)

Volunteer support people seem to respond quickly if the content is easy to read.

For the time being, English and Russian seem to be prioritized.
It seems that some people can read other languages, but it seems to be slower than the English one.