How long does one gallon of tar last when patching holes on the roof, until it runs out

Please donate to help support You're a conspiracy nut either using the internet or by postal mail at po box 143 Anson, ME 04911, Thank You

Someone donated a gallon of tar and some tape so I could work on my roof, Thank You very much 🤗

I didn't use the tape yet but the tar is there and hopefully it stops some of the leaks, I say some because I ran out and the best way to stop them all is to replace everything not just throw more tar on it, make no mistake though, I am thankful for the tar 😏