Hi! Number 2 is incorrect isn't it? Thanks, Fulvio
1. I haven't had time to study it.
2. I haven't had time to studying it.
3. I haven't had time for the study of art.
Yes. Also, "I haven't had time to study ~" is more usual than "I haven't had time for the study of ~".
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Yes.
Also, "I haven't had time to study ~" is more usual than "I haven't had time for the study of ~".