You people have great fun of this guy! But seriously.. Everything depends on family. In some it may be important but I think that the engaged couple should decide what is best for them. However an engagement ring means also obligation to 'serious intentions' toward the girl.
is it normal to be engaged for 2 years there?
It's hard to say, but for me it's a bit too long - such time should be more than enough to choose either way.. marriage or freedom of single status.
On the other side there's growing number of Poles living long years together without any registration. Since a 'healthy family' shouldn't push too much, the marriage is very welcomed but only if the relationship is widely accepted.