I use a 20+ char password generated with KeePass and keep my OS secured. Never had any issue.
BTT allows you to put a 256-bit password (64 characters), consisting of lowercase letters and numbers. And if you add uppercase letters and characters, the password strength can increase to 400 bits.
Example:
9h$Vcruk0dz~M*!42J@&QUc%!Px=Xfm3@`O/2QOgJ+uSnLyt+U%pj?5cCF.DGG4j
If this is not enough

, you can insert parentheses, space, underscore, and upper ANSI characters into the password. The password strength will increase to 500 bits.
Example:
Ö~ë¡Þ¾òí×Oó´I¥êð`ÑfÃåÛÁCÂ{\C©#ó'4cBæ¢øR;ü"ötJ³ZÿBè~1¬ýZÉø1ÕE¸V#¨
KeePass is a very good program for this.