Does the pandas.Series used have to contain explicit timeseries?

[Lqs66]

I noticed that the example provided in the documentation contains explicit time information:

Date-Time (GMT),Water Elevation [m NAVD88]
1920-06-01 05:00:00,-0.659
1920-06-01 06:00:00,-0.873
1920-06-01 07:00:00,-1.025
1920-06-01 08:00:00,-0.964

Is this necessary, please? When using BM can I specify the size of the block without using the time specification? For example specify 30 numbers as a block.