How long does it usually take for a campaign to actually distribute the tokens of the participants?
Depends on the campaign. Most commonly, after the end of the ICO.
Why don't you ask in your campaign's official communication channels or in the official thread?
Thanks Sir, i will do that. I'm thinking of the average waiting time. I heard that there are some campaigns that don't distribute tokens properly.
There is no average waiting time. It's all relative and depends on the campaign. Basically, after the end of the ICO it takes a short time for managers to calculate the stakes.
Of course, there have been campaigns that have never paid the awards to participants... but they are scammers. You should be careful before joining the campaign.