@BritWifeinUSA
You weren’t working for your boss, you had free choice what time to leave, where you go, how long to spend there, what to wear, which route to get there, how much to spend, what to buy for whom, what to eat or to eat nothing at all. If that’s not the very definition of freedom then you have no idea how large numbers of people live in this world
Lots of people satisfy most of this criteria whilst at work (especially the self employed), but I'm not sure that anybody would suggest that this could be defined as "free time". Having autonomy and control isn't the same as having completely free time with no obligation to achieve anything or get something done.
If you live in a household then certain tasks and chores have to be done to facilitate a reasonable standard of life. Most of us see Christmas shopping as a pretty important task irrespective of whether you enjoy it, if you do it online or who ends up doing it in your household. For many, a Christmas without gifts or one which risked hurting family member's feelings with the lack of a thoughtful present would be a very sad occasion indeed. So whilst there is no boss telling OP to Christmas shop, she is doing an important family chore prior to the deadline being due. For me, it's the same category as sorting the children's school uniform and food shopping etc, which all require some degree of thought and effort.
So what happens if we assign the time spent doing all of these "important family chores" under the category of "free time"? For starters I believe it suggests a level of choice and martyrdom that isn't actually there. If you have a household without food, clothes or Christmas presents then many people would (quite accurately IMO) accuse you of neglect. I also think it makes a mockery of the MN concept, that I generally agree with, of both people within a couple having the same amount of free time. Following this principle then OP has enjoyed a day of "free time" essentially serving the family's needs so her DP can spend his time serving his own needs doing his hobby. That would be fair though right, as both had the same amount of free time? She also can spend her free time doing the housework and cooking, whilst he can sit on his arse watching Netflix and going to the pub.