...I hope you are making it okay this week! I am sure you are hitting the really uncomfortable part of treatment by this point. Hang in there!
It's hard for me to say exactly how close you might be to the end since I am not a doctor, but the fact that you aren't noticing any crust yet is always, for me, a sign that I should keep going.
Also, you are doing once daily and that may, indeed, take longer to show signs of erosion. I have always been prescribed twice daily for 28 days and usually show signs of erosion slightly before the 28 days are up.
Be sure to check in with your doctor around the 28 day mark or if you show signs of allergic reaction or crusting. Your doctor's office is a great resource for you. Please keep us updated on your progress! Sending you hugs!
I am including a link to an article on healing. You'll be there before you know it!
https://skincancer.net/life-with-skin-cancer/efudex-side-effects-tips/
April, SkinCancer.net, Moderator