If the thing is practically invulnerable until the tip-over point it makes being available on Thursday/Friday the only way to truly engage.
No.
I did 2M on Tuesday (to cover me for a week until next Monday).
I did 2M on Wednesday (to cover me 'til Tuesday).
OK, it was harder, and took 3 or 4 runs on the core, but I got the 2M - I am working all weekend so will probs miss the big KABOOM, but tagged my 2M for all the rewards (as I have done for all 3 up to now).
On Thursday, after it became vulnerable, I got >2M per run on the core, but ONLY in Solo - I tried Open a couple of times but Titan was stuck on blue vents and no core (about 40 CMDR's and hundreds of Tharg scouts - instance totally bugged).
It is too late now, I know for Hadad, but everyone PLEASE, PLEASE note that on the
next Titan (June/July/August?), an hour spent on a Tues/Wed just to get 2M, covers you for 7 days after, in case it is destroyed within those 7 days (which all 3 previously have).
All the rest of your playing time in that week, can be doing whatever you like!
It is also unlikely to last until Saturday as it stands, so anyone who can't play until Sat WILL miss out on the rewards unless you have spent a simple hours worth getting 2M in the last 6 days. SIMPLES.
EDIT - I also will avoid going into it tonight after work as, although I do enjoy the bombing runs, I will refrain and let other CMDR's get a nibble on it and partake of the rewards.
EDIT2 - maybe not!