XPs can only be earned from interacting within the forum. Minigames only give you gems. For your other question, survey lengths are varied and there's practically no limit to how long they can take, but more often than not they will state their length right before asking you to join, so read carefully.
Yes you can because i dont know how
Surveys take long and I don't think you will earn XP by playing minigames
I can barely do any survey in my country
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
Also, how long do surveys take? It feels forever doing all of the surveys.