  Virus capsids in interchromatin corrals of a cell nucleus are experimentally
known to exhibit anomalous diffusion as well as normal diffusion, leading to
the Gaussian distribution of the diffusion-exponent fluctuations over the
corrals. Here, the sojourn-time distribution of the virus capsid in local areas
of the corral, i.e., probability distribution of the sojourn time
characterizing diffusion in the local areas, is examined. Such an area is
regarded as a virtual cubic block, the diffusion property in which is normal or
anomalous. The distribution, in which the Gaussian fluctuation is incorporated,
is shown to tend to slowly decay. Then, the block-size dependence of average
sojourn time is discussed. A comment is also made on (non-)Markovianity of the
process of moving through the blocks.
