The solution of @Martin_Tschanun will work fine.
After this optimization you will probably find the need to optimize more:
How about weekends? Same time?
I am a big fan of splitting up flows (see my post “how to structure your flows”
So to make it future proof and understandable, split it up:
Make separate flows for setting the temperature (like Martin proposed) but start them with “when this flow is started” or a virtual device.
And create two flows started by the times, these will trigger the flows create above.
Advantage: when you decide to have a different weekend routine, just add another flow with the desired day and time (and exclude that day and time from the other flow)
And you are futureproof: even if you have a different time for every day. If you want to change the desired temp to 21c, you only need to change just one flow.
I use virtual devices tomstart the flows
