Minecraft Java Edition – How to Use /setblock in 1.12 to Make a Blue Banner

You can use the /stats or check the CommandStats datatag of the ArmorStand. I highly recommend use of the /stats command.

Extract the result:

Run these commands once
Note: Anything suffixed with a "_v" can be whatever you want, as long as they're consistent.

/scoreboard objectives add SuccessCount_v dummy
/stats entity @e[type=ArmorStand,name=Lexer] set SuccessCount @e[type=ArmorStand,name=Lexer] SuccessCount_v

This will store the SuccessCount (in case of this command, 0 or 1) in the scoreboard as @e[type=ArmorStand,name=Lexer] SuccessCount_v, which you can then test and use as you would any other scoreboard value.

Add results together:

I'm not going to go into detail here, since I am unsure exactly you want to add together. I will, however link you to a wiki page where you can find the format of /scoreboard players operation <selector> <objective> <operator> <selector2> <objective2>, the only method for doing math in command blocks. (Yes, there is a command dedicated to it. It is not impossible.)

Hope this helps and wish you luck!

You can make a scoreboard:

/scoreboard objectives add time dummy

Create a entity which counts for you:

/summon ArmorStand ~ ~1 ~ {CustomName:"timeCounter",CustomNameVisible:1}

Make it it invisible and a marker if you want:

/summon ArmorStand ~ ~1 ~ {CustomName:"timeCounter",CustomNameVisible:0,Marker:1b,Invisible:1,Invulnerable:1,NoBasePlate:1,NoGravity:1}

Then a repeating command block which increases this scoreboard every tick (20 ticks = 1 second):

/scoreboard players add @e[CustomName:"timeCounter"] time 1

Put your commands into an execute:

/execute @e[score_time_min=200] ~ ~ ~ effect @a 16 10 1 true

/execute @e[score_time_min=200] ~ ~ ~ time set day

Change the 200 to whatever seconds you want * 20:

Sorry, I first understood your question wrong, just remove the reset.