I could have had about 500 already.. they keep dropping after activities but I'm maxxed out after a day.. it's ridiculous.
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don't bother than, play one day, spend everything and the day after you are back at max. no need to have 100k in your inventory. Xur has most of the time nothing special to offer anyways. just be happy materials now are easier to get than before and you are getting loaded with them.