Anyway, the Ben's was empty by July 24 5:10 AM, so it lasted 5-6 days. However, I was using some "Off!" at the same time, so maybe more like 5 days. The problem with the Ben's was that it was hard to get the spray to spray. It depended where on the top you pushed down. If you push at the front, nothing happens. Most of the time, instead of a spray, it came out in a weaker stream, and I ended up wiping it by hand over whatever skin I was trying to apply it to. I did put it on clothes for the backs of Tee-shirts and on my socks.
"DIRECTIONS: . . . Apply sparingly, not under clothes, and only when necessary. Dispense small quantity into hands and apply over all exposed skin, avoiding contact with eyes and mouth. Do not spray in enclosed spaces. Wash hands after applying. Use just enough to cover exposed skin. Reapply after approximately 6 hours if necessary. PRECAUTIONS: . . . . " (I'll continue this later.)
This is Very different from "Off!". The oily component seems to be intended to hold the DEET in solution and slow down its evaporation. I applied it more than they recommended. Essentially, I used it like "Off!" but a bit less frequently. Their instructions to put it ON SKIN and NOT clothes and NOT UNDER clothes, means it won't protect your legs or most of your body. This won't work. Ticks don't just go after your face. Also, washing my hands after apply the spray would mean my hands would have been unprotected, and yes, I did get bitten on my hands before I started using these repellents.
Another matter is that the can is slippery if you get it on your hands. This is partly why I had difficulty controlling the spraying. I found that wrapping the can with some "masking tape" made it usable, but I could not read the instructions (which is worth re-reading occasionally).
I guess that if I had a combination of "Ben's 30" and "Off!" pump spray and used them both as directed, I'd be well protected and it might save me money, but that's getting really complicated.