Usually not as many as advertised. In my opinion surveys are not worth your time. Use the mobile app to earn credits using the sponsored games. I made 140 credits just this morning playing yahtzee. I used those credits to pull an Enigma and Kate.
I've actually gotten tons of credits from the Peanut Labs surveys. They tend to take some time to complete and you might get redirected to other surveys if you dont match the target demographics, but the rewards are good. However, the app rewards are probably better for most people.
I usually find the big ones like 50+credits never give because they want someone who matches up to their demographic by 90-100% 1-20 credits usually accepts more people. I recommend do download app missions it is usually pretty easy with good reliable payouts with rewards that scale with how much time you need. 1-40 credits can be done within an hour to off and on through the day 50-120 a day or 2 of regular play 300+ about a week of 2-3 10min play sessions a day. Most games on these list are usually luck based like slots/bingo or clones of popular titles and many of the big reward apps are clones of each other so after 1-2 you get an understanding of the best way to reach the goal in the fastest way possible and after you get the hang of it 3-5days
By download app I meant the game apps I usually don't trust the other ones. They game app downloads are there so they can inflate their download numbers and active player base to sell their product so it usually isn't malicious in my opinion just make sure to read the comments in the app store for any red flags other than its a cheap generic bad game. They usually are pretty boring basic cards.
I don't do them
If I really want credits relative to my time, I would just ask for more hours at work
Spending 3 hours to earn what maybe, 200, 300 credits. Doing the most boring and stupid survey BS. Or? Working 3 extra hours and buying 3340 credits with the money you earned
The only person who should be doing surveys is either unemployed or a schoolkid, if you're neither you're wasting your time
They work for me thru the chrome browser on android. It is worth checking, there are some really high value ones 200-500 credits for a 30 minute survey. You get kicked out after a few questions half the time, and then they offer one for 20-80 credits and it seems like you dont get kicked out of those.