While it depends on the person, I would say striking is easier than grappling to learn. For me personally, I've been striking under a year and I do well against people that have way more experience. I wouldn't call myself a great striker by any means, but I am average. I've been grappling since September (when I started kickboxing), and against any blue/purple belts I face I lose definitvly. I realise I am still a rookie in both areas, but I'm a lot more progressed in striking than I am BJJ.
Developing the basics for striking takes about 3-8 months with a decent trainer, and becoming an advanced striker takes about 3-5 years.
Learning the basics in BJJ takes about 6 months - 1 year, but learning to be an advanced BJJ guy takes about 7-10 years.
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