Whenever you store a value that has a unit in a variable, config option or CLI switch, include the unit in the name. So:
maxRequestSize
=>maxRequestSizeBytes
elapsedTime
=>elapsedSeconds
cacheSize
=>cacheSizeMB
chargingTime
=>chargingTimeHours
fileSizeLimit
=>fileSizeLimitGB
temperatureThreshold
=>temperatureThresholdCelsius
diskSpace
=>diskSpaceTerabytes
flightAltitude
=>flightAltitudeFeet
monitorRefreshRate
=>monitorRefreshRateHz
serverResponseTimeout
=>serverResponseTimeoutMs
connectionSpeed
=>connectionSpeedMbps
EDIT: I know it’s better to use types to represent units. Please don’t write yet another comment about it. You can find my response to that point here: https://programming.dev/comment/219329
Not sure what languages you commonly work with, but in good modern languages you can simply declare “feet” as an alias of integer (or double?), and no refactoring would be required.
And any good toolchain to parse / generate JSON/etc can absolutely get the types right.