This is a simple toggleable Minecraft mod for Fabric, that displays how many blocks you need to climb UP/DOWN (in the action-bar) when climbing something (to reach bottom/top).
v1.0.1 - Added information to the climbing display, containing the ETA (Estimated Time of Arrival). The ETA info will show you how many min/sec it will take to reach the top or bottom of a chain of climbable blocks.