task lap

I'm lousy at predicting how long it takes me to do stuff.

I've been using my watched stop watch to collect "lap" times and total times for cleaning restrooms.

Time intensive.

there sight to be an app for this.

Specs:
Job
"location"
list of sub tasks: dust, sweep, toilet bowls, surfaces, sinks, mirrors, supplies, mop, trash
Appt records a record with date, time, job, location, and task.
needs pause and abort buttons.
job selection screen.
job creation screen.

what else?

Drag - drag racing simulator

one of the BASIC games we use to play on Dad's computer was a single hear drag racing simulator.
You input horsepower, gear ratio (?), the width and diameter. Then the program would print out the race.
Time would make a fun retro app.

Unfortunately, I have no idea how to do the calculations…

Simple or hard engineering problem?
Has a someone already done it?