Manuals and time calculators for SEQUOIA can be found on the Hedwig Proposal System.
The SEQUIOA map calculator does not produce the best estimates of observing time if the desired region is 2 arcmin or smaller. If you want to make smaller maps, we recommend two possible strategies: (1) just go ahead and make a bigger map using the standard OTF ("on-the-fly") procedures with a size of approximately 2 times the array dimension; or (2) make use of PS ("position-switching") observations to sample the source within the footprint of the array.
For more information see section 5.3 of Observing with LMT - SEQUIOA document.