The element variable tag {ce_count} is parsed inside every element tag pair and contains the element count for the current entry. This is a count of all elements, not just this specific element type.
Simplified case example:
{exp:channel:entries channel="your_channel" limit="10"}
{custom_field}
{heading}
{value}
<p>This entry has <strong>{ce_count}</strong> elements.</p>
{/heading}
{/custom_field}
{/exp:channel:entries}