Hello,
I'm very interested in your job and offer good, quality content in good time. My writing is, as I hope this will demonstrate and completely without arrogance, of a very high level, driven by one hundred percent effort at all times.
I've made a bid on two day's work but I would expect to finish it sooner. I just think it's wise to over-estimate so that, in the event of any unforeseen circumstances, it's still possible to achieve a good completion rate.
On my first and, so far, only project, I made a bid of 1 day and had the work completed in just a couple of hours (approx. 1800 words).
So, I hope you'll accept my bid and wish you good luck regardless of the outcome.
Regards,
Mike