Ummm, kinda depends but maybe 1-2 per week. It's less when I'm feeling down as I do not force myself to create content and when I find myself doing so, I stop immediately - it's like a feeling in my stomach and I have to listen to it. I'm going to keep buying £100-150 SP/month whilst the price is around £1 per steem or less, don't really care about maximising - it's a long game. I'd love to be able to blog for a living, but atm that is not an option. I do believe this will change some time in 2019 (when the Steem engine picks up speed) and I look forward to the day. I'll probably up my del to UA soon and should also soon have enough SP to be able to do that an still have 500+ to vote with. Currently the delegation comes out of what you delegated me, and this makes me feel as if you are paying for my UA upvotes, which is why I'm suggesting that you undelegate (plus the fact that I'm >500 now).
Thanks Asher :)