At least you're not doing what my little brother does and measuring your jobs in "beers," meaning figuring out how many beers you're going to go through to do something.
For example:
Changing oil: crack open one, take about four or five sips out of it, and forget you had opened it; try to drink it flat the next day, realize it's not worth the pain
Rotating tires: 1 beer drunk quickly because you decided to race through the job and you're very thirsty
Cleaning up the edges of the house with the weed eater or re-seeding your lawn with the push seeder: 1 beer
Mow the lawn with the John Deere: 2 beers
Replacing brake parts: 2 on disk, 4 on drum
Circling and gazing under the hood of the Land Rover your father-in-law bought used because "it was a steal:" 5 beers, 6 1/2 if you're mooching them out of his fridge...
Replacing clutch on an F150: 5 beers, 1 Swisher Sweet
Rebuilding carburetor or throttle body: 2 beers, but beers that are drunk slowly, as one is heavily pondering thoughts...
Having to take the enging out of your big brother's Subaru Legacy, remove the heads, replace the valves you bent when you thought you could re-use a broken camshaft belt tensioner, removing the other head because you had to buy a pair of head gaskets anyway, and you might as well clean the other head up, put everything back together and get the engine back into the car: A dirty thirty, two 5-packs of Swisher Wood Tips, one screwdriver that wound up having its handle crack in half after we pinched our fingers in a valve spring and got pissed off, one trip to Sears to replace the torque wrench you assume is broken, half a pizza, and a package of Reese's Peanut Butter Cups
Helping your buddy build his deck in the summertime: 1 beer every 20-35 minutes, bump pace up to 1 beer every 10-15 minutes if beer is coming from buddy's cooler instead of yours
Cleaning your shop (Bison, take note...): anywhere from 3 beers to renting a keg and a tap, depending on size, complexity and overall mess; quantity consumed also depends on whether or not the person cleaning said shop bumps into a stack of old magazines that one can't help but thumb through "just for a couple of minutes..."