Chapter 4

Much the same as 1 Kings 7.

The altar was 30' x 30' x 15' high.  That would make it possible to have many sacrifices at a time on the altar.  It was not a single file thing.  That also explains why so many priests were necessary - those sacrifices had to be washed, dispatched, butchered in many cases, and then place on the altar.

Here is something interesting:

2 Then he made the sea of cast metal. It was round, ten cubits from brim to brim, and five cubits high, and a line of thirty cubits measured its circumference. [2Ch 4:2 ESV]

10 cubits in diameter, 30 cubits in circumference.  That's a rough approximation of pi.  Certainly says they were aware of the ratio.

6 He also made ten basins in which to wash, and set five on the south side, and five on the north side. In these they were to rinse off what was used for the burnt offering, and the sea was for the priests to wash in. [2Ch 4:6 ESV].  Again, many sacrifices could be offered concurrently.

This is a good verse to associate with baptism.  The washing that was done, from the very earliest of times, was to prepare the sacrifice.  To make it presentable for sacrifice might be a better phrasing.  The priests themselves also had to wash, before they made the offerings.

I note that there are some differences in dimensions for some of the items when comparing 1Ki to 2Ch.  MSB notes say that the basin itself held the smaller amount mentioned in 1Ki, of 2000 baths.  The 2Ch reference to 3000 baths included the storage of 1000 baths to keep the fountain going.  It must have drained, somehow been put back into storage above the water level of the basin itself, constantly, so that the fountain was active. 

I expect any other differences in dimensions have explanations also.  These two writers were not focused on exactly the same details.  They described the same things but from different vantages.