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You can't change the time in MT, at least this is what I know. If it was possible, it would be somewhere in the settings
There is no limit in Buy/Sell blocks. When you run such block, it will try to create a new order. I will eventually add something like this in them, but now you can just do something like this:
https://fxdreema.com/demo/mt4-buy-now-i ... ade-exists https://fxdreema.com/demo/mt4-sell-each-bar
I have no experience with Mac, I have no idea at all