A bunch of us run these, and I've got a batch of R100 on order too. See my mixing breakdown below. Worth noting, both my spouse and I are on Reta together. Usually we go with a pair of R50 or R60 vials, occasionally dropping to R30, though that smaller size only stretches to three doses each.
R140 reconstitution breakdown.
I draw 6ml BAC total into a 10ml vial. Split it, 3ml goes straight into the 10, and 3ml goes into the 140mg vial. Then filter that back into the 10ml vial that already holds the other 3ml BAC. Ends up as 14 doses at 43 units each. Two of us pulling from that single combined vial. Stretches roughly seven weeks.