standard downswings

[onlinebeginner]

how many buy-ins are necessary if you are in the top 10% of players in a:
1. 27 person tournament
2. 45 person tournament
3. 180 person tournament
4. 400 person tournament

i've been playing mid level buyin mtt tournies (by stars standards) after a long break from poker. I've been pretty much in the zone and have been playing great ABC poker, not that this is very hard at these buy in levels. ANYWAY last six tournies I have gotten bad beat or have been dealt a cold deck so it just got me thinking about standard downswings.

Thanks in advance for all the input