Do you practice Tithing or do you donate a different amount? How much do you recommend? [Spirituality & Religion]

At first, for two months I took a bit of a risk and donated 20% instead of 10% (Tithing) and now...I am starting to see that donating 20% a month is not that suitable for me.

How about you?
Do you practice tithing or do you donate a different amount?

Do you think that 20% is too much?