First of all: over time you will read a lot of bad things on APUG about BLIX (compared to separate bleach and fixer), but these rants apply to C41 and E6, not RA4.

When I do RA4, I usually mix 500ml of working solution and use this for one or two days, which means one or two dozen test strips and about a dozen final prints 5x7" or 18x24cm. I never had any indication that BLIX was exhausted, but did use a fixing stop bath to reduce the load on BLIX.