The Time Exchange Rate

You know your income. You don't know your exchange rate.

Time is the one currency you spend without a price tag. This book gives it the operating system money already has: a rate, a ledger, and the rules to use them. Start by finding what one hour of your life is actually worth.

1 hour= $0.00/ net Your number, in about two minutes
The gap

Money got an operating system. Time got a slogan.


You learned budgets, compound interest, the difference between an asset and a liability. No one built the equivalent for time.

So the hours you spend on things that matter pass by in fragments, a few minutes here, a broken afternoon there, and the days feel full and thin at the same time. The book calls this time poverty, and it shows up even for people who earn well.

The answer is not moving faster or doing more. It is measurement.

Start with one number

Your Time Exchange Rate

The real hourly value of your time, once commute, after-hours work, taxes, and the cost of working are all counted. It usually lands near half of what a salary implies. Once you have it, a purchase, a meeting, or an obligation stops being a feeling and becomes a figure.

Step 1: total annual income
Salary
$
Other income
$
Step 2: total annual hours
Work hours / week
hrs
Work-adjacent hours / week
hrs
Commute, one way
min
Commute days / week
days
Weeks worked / year
weeks
Steps 3 and 4: take-home and work costs
Effective tax rate
%
Commuting and parking / year
$
Other work costs / year
$
Keep your number

Get your individual result and the starter time ledger.


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Inside the book

A framework, not a pep talk.

Ten ideas that build on each other, each with an exercise or calculator behind it.

01Time Exchange Rate
The real hourly worth of your time, and the number every decision runs through.
02Time poverty
Why full days feel thin, and the one thing worth measuring first.
03The time ledger
Every hour read as an expense, an investment, or waste.
04Protected time
The hours you defend before anything else gets to bid on them.
05The executive time portfolio
A leader's calendar treated as capital allocation.
06Pricing your time
The floor below which the work is not worth doing yourself.
07Buying back time
When paying for hours is a discount, and when it is not.
08Time inflation
Why the same hour costs more as your remaining supply shrinks.
09Time abundance
Designing a life that runs at a surplus rather than a deficit.
10Time legacy
What your hours will add up to, measured while you can still change it.
Who this is for

Anyone comfortable with money, short on time.

Written for executives making calendar decisions worth more than they look, founders whose own hours are the company's real constraint, and anyone financially literate who wants a framework instead of another productivity hack.

If you want motivation, this isn't it.
If you want a system, it is.

Time: The Ultimate Currency — book cover
Coming Soon

Time: The Ultimate Currency

The Operating System for Your Most Finite
and Neglected Resource

Fifteen chapters that build the system end to end, from your personal rate to business decisions to the life the ledger is ultimately for. A full workbook of exercises sits at the back.

By Mert Sahin, PhD.

Get notified at launch
About

Mert Sahin, PhD

Portrait of Mert Sahin
Mert Sahin holds a PhD in Cell and Molecular Biology from University of Hamburg, Germany and has more than twenty years of leadership from venture-backed startups to multibillion-dollar global conglomerates in various industries. He has lived and worked across continents, leading turnarounds, scale-ups, and international expansions, and lessons learned through designing organizations and his daily life shaped the operating system presented in his book.