mysql text type max length
Type | Approx. Length | Exact Max. Length Allowed
-----------------------------------------------------------
TINYTEXT | 256 Bytes | 255 characters
TEXT | 64 Kilobytes | 65,535 characters
MEDIUMTEXT | 16 Megabytes | 16,777,215 characters
LONGTEXT | 4 Gigabytes | 4,294,967,295 characters