The "trick" of the one minute fix with film strength fixer may well put your images on the path to fading much quicker than you expect. Ilford recommends this method... with their papers. Some papers will not fix properly in this time. They also say it works with fresh fixer. This may mean that after two prints in a litre of working solution you have to dump & pour new or lose the working strength and "archival" properties you are looking for.
Better to use the two bath method & be safe rather than shortcut on time & lose your prints.