The database schema says 200 characters.
AgentFAQCategory.dtl: $Config{"FAQ::FAQHook"}:$QData{"Number"}<span> —</span> $QData{"Title", "60"}
AgentFAQExplorer.dtl: $QData{"Title","50"}
AgentFAQHistory.dtl: $Text{"History of"} $Config{"FAQ::FAQHook"}: $QData{"Number"} - $QData{"Title","60"}
AgentFAQLanguage.dtl: $Config{"FAQ::FAQHook"}:$QData{"Number"}<span> —</span> $QData{"Title", "60"}
AgentFAQLanguage.dtl.save: $Config{"FAQ::FAQHook"}:$QData{"Number"}<span> —</span> $QData{"Title", "60"}
AgentFAQOverviewSmall.dtl: <div title="$QData{"Title"}">$QData{"Title","40"}</div>
AgentFAQSearchResultPrint.dtl: <td class="contentvalue">$QData{"Title","40"}</td>
AgentFAQZoom.dtl: <h1 title="$Config{"FAQ::FAQHook"}: $QData{"Number"} – $QData{"Title", "40"}">
AgentFAQZoom.dtl: $Config{"FAQ::FAQHook"}: $Data{"Number"} <span>—</span> $QData{"Title", "60"}
AgentFAQZoomSmall.dtl: <h1 title="$Text{"Zoom"} $Config{"FAQ::FAQHook"}: $QData{"Number"} – $QData{"Title", "40"}">
AgentFAQZoomSmall.dtl: $Config{"FAQ::FAQHook"}: $Data{"Number"} <span>—</span> $QData{"Title", "60"}