What's a horlick? (And don't tell me "It depends on how much you pay her.")
When you start a thread, the text you type into the "Thread Title" box is limited to 40 characters.
In addition, you might have a prefix such as "Chord Req:" which adds up to 11 characters (including the space after the colon).
So the longest thread title you can create could be up to 51 characters if you choose the longest possible prefix (but I suspect it will get truncated to 50), or 44 characters if you choose the shortest prefix "BS:", or 40 characters if you choose no prefix at all.
The above restrictions apply to every thread when it is started, regardless of who starts it. If you see a thread with a longer title than what is allowed by the above limits, it means a JoeClone has changed the thread title AFTER the thread was started.
The font has no effect.
If a JoeClone changes your thread title, s/he sees your entire thread title (including the prefix, if any) as one field with a maximum length of 50 characters. So that means there usually is room to add a few characters.