You'll get a color shift. Then it will become very difficult to fine-tune your final results or even predict them. I am allergic to RA4 chem, so what I do is load the drum in the dark and then process
it outdoors under a shaded canopy (obviously in mild weather). My big processor is actually on a wheeled cart. But if you simply buy an inexpensive drum, you can simply slowly roll in back and forth
on the bed of your darkroom sink for the prescribed time. You don't need to spend big bucks for
the learning curve. I assume you know how to make a water bath for keeping chem bottles at the correct temp. RA4 printing is really quite easy once you learn the basics.