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For me shave 3 and 4 with a quality blade are my favorite ones. Sometimes I use them up to 6 times but more often than not I ditch them after 4.
That being said B&B has users that have the skill/skin to go for 30-40 shaves or more per blade...
Arko is a great choice for a fixed item so you can put this out of the equation of variables. If you can confidently build lather with it you can try out different blades and have a yardstick as to what works best for you.
Blade: Gillette Minora stainless 2nd use
Brush: Yaqi Sagrada Familia 22mm Two Band
Soap: Colonel Conk Bay Rum
Post: Alum, generic Witch Hazel, TOBS Bay Rum
Result: BBS, 2 weepers
The Minora is smoothing out nicely so I pushed for BBS - a bit to hard - and received 2 weepers...