You should have narrowed the topic. I'd say it is easily once per week with regards to 4* crystals if you are in an alliance that runs wars and you grind arena each and every cycle.
For 5*s it really depends on your war tier. If you are above tier 7 for war like my main account I am probably opening a 5* crystal at least every 6 to 8 weeks.
As soon as I get them after saving them up for a while and taking 4 deadpool xforce duplicates in a row from spinning them when he was already maxed out and rubbish made me sick so now I open on landing lol
If you know the formula, you can open 6 4* a month and 1 5* every 6-7 weeks just from arenas and event quest. This EXCLUDES rewards from story, one-off events (bautista, ming-na, spidey challenge), RTL, LOL, ROL monthly and festive calendars, as well as gifts from kabam.
Four stars are easy now. Get 1 from arena now if i need the champ. Or a bunch of 4/5 star shards if I'd rather have the shards. 5 stars depends on how well the alliance does but probably 25 days or somewhere around there.
Depends on the time of month. Good AW weeks more than once a week along with weeks when there is content I complete. I'd say at least one a week though at min.
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For 5*s it really depends on your war tier. If you are above tier 7 for war like my main account I am probably opening a 5* crystal at least every 6 to 8 weeks.
You can't put two different questions and fuse them into one, it just doesn't work. ._.
I have just 1 5* and today I'll open my second one, in 7 months playing this game.
At least 1 4* weekly