Variance in MTT's

Sorry could not find what I wanted by searching. When I first started playing poker I played mostly SNG's and MTT qualifiers on Party and did reasonably well. Last 9 months have switched to SS Limit also did decent. I recently played in two live tourneys and did extremely well/lucky (top 3 (chopped) of 100 in a $100 buyin and 5th out of 300 in a $300 buyin).

I play to make a little money on the side and don't think I really have the time/dedication to try to play higher limits ring games, so I was thinking about switching and just playing MTT's ($5-$50 buyin's, try to qualify for bigger tourneys).

Would really appreciate if anyone had any thoughts about the type of bankroll I need to play these types of tournaments. I know this depends on what type of edge I have in these games, I definitely am an overall winner in SNG's and MTT's but didn't have PT when I played them, but have no idea on ROI or anything like that. Thanks for all advice.

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100+ buyins to be safe

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100+ buyins to be safe

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Cool that's probably all I need to know. Thanks.

[Shorty35]

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100+ buyins to be safe

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Cool that's probably all I need to know. Thanks.

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And stay away from rebuys at that level of bankroll