An average of 500k can be sent
Sometimes 1000k is also possible
Agreed that it would be very wise to mine to one wallet & send to another (50 small tx < 1 tx) , might even want to use a new mining wallet after it reaches so many MB. I have seen people keep the same .dat or .wallet with giant files & still work, but wouldn't recommend it. Also always back up before you start to use the address, never save over your starting file & always save a new backup (keep the 1kb file is key). Just my 2 sat os hi, as the testing never stops & can't be fully automated just yet.