switching from wallet 1 to wallet 2, a lot of loss of time and of course the loss of time for startup phoenixminer, must be an easier way for this, without the waiting times and the start-up time of the Miner itself.
As advised in the previous replies there are so much simpler solutions utilizing wallet transfer of the mined eth... However if you insist on a complex solution then I can program solution utilizing the remote management API and epools.txt. Send a PM message to get my full proposal for the not free solution.
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To add.. I would just run two instances of phoenix on startup. Program 1 mines 6 GPUS to one wallet, and the other instance will run 2 GPUS to another wallet or however you want to allocate the percentage split. The time limit switching as everyone else has said, is a not as an efficient of an approach.