It took for me four years to reach the advanced level from the intermediate.
Probably you have better conditions for your studies than I had. But if you don't have enough free time don't be too much optimistic.
May 7, 2019
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It depends on your skill to learn more or less quickly. You have to work several contents : vocabulary, reading, listening, speaking, grammar...
Italki is one of the ways to improve his English.
Learn a new language must remain a pleasure, not a constraint.
May 7, 2019
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Good afternoon!
This is a very broad question that needs to take things like your dedication levels, ambiguity tolerances, how much time you have, natural language absorption ability, and so on.
I went from A1 to B2 in German in a year without lessons - I was living in Germany at the time. I had no need to go any higher. On italki, I imagine -with dedication and effort- it would take about the same 12 months to achieve a language level of C1.
If you are interested, then please have a look at my profile and see if you think I may be of service in helping you achieve your aims.