How to get length of data on column with long datatype

How to get length of data on column with long datatype without using pl/sql block

...another reason not to use LONG datatype for columns.
Oracle advises to switch to LOB columns instead
SQL> create table t
2 (x long)
3 /
Table created.
SQL> insert into t values (rpad ('x', 10000, 'x'))
2 /
1 row created.
SQL> alter table t
2 modify x clob
3 /
Table altered.
SQL> desc t
Name Null? Type
X CLOB

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How to get length of data on column with long datatype

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