Length Limit for display-name

Section 3.4. Address Specification of RFC2822 specifies

name-addr       =       [display-name] angle-addr

What are the length limits on the display-name field? I take it a long
display-name
value would simply be folded as described under 2.2.3. Long Header Fields

Are there practical length limits with respect to current SMTP clients
and servers?

Stephan