Limits and units

Value	Exact limit
Title	160 UTF-8 bytes
Description	2,048 UTF-8 bytes
Image URI	256 UTF-8 bytes
Day	86,400 seconds
Tokyo offset	9 hours
Minimum-bid denominator	100,000
CLAY decimals	18

UTF-8 byte length can differ from visible character count. Contract token amounts are integers in base units. Auction and Tablet IDs start at 1; submission IDs use a separate positive counter.