Try slicing the two models and compare projexted buildtime in pronterface
Dont forget to add in
Extra time watching for end of first print. Removal of tbe first model
Preparation of build plate for second model
Re heating anad mesh levelling. All of which will need to be added to the two separate model process
Do the checks with two medium size models and two tiny models. On the tiny models the slicer may slow down a lot because of small layer time. Where as tbe travel time may allow for faster printing on two models in the same job.
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.