Slow Progress

I haven't been tatting much lately, so although Round VI is a very easy one, it has taken me a few weeks to complete. Here is my latest progress on the Stawasz Doily Tat-along:

I like to use a folding chair as a foot rest while I tat, which also doubles as a resting place for the doily when I am not working on it. It looks very small on the chair, but my eyes have gotten used to looking at size 100, so anything larger would look really big by comparison:

I still haven't made it through my first ball of thread yet. I wonder how much of the doily I can complete before running out. I have one more full ball of size 100, which I got for free because Handy Hands mistakenly sent me white instead of ecru on a previous order. They have great customer service and let me keep the ball of white thread as well as sending me the correct color. So, if I can finish the project with two balls of thread, that will be a total cost of $3.75, which is kind of funny to think about for such a massive project. I also wonder how long I can keep it on the folding chair before it gets to be too big and starts to spill over...