long delayed check then min raise, a reliable tell?

I've seen this happen every now and then, someone takes a suspiciously long time to check, then makes an instantaneous min raise or push. The SB took a really long time to check here and makes a quick min raise on this rag flop. Is this a reliable tell or did i outthink myself?

Ultimate Bet No-Limit Hold'em, $.10 BB (7 handed) FTR converter on zerodivide.cx

BB ($4.90)
UTG ($4.90)
MP1 ($6.20)
MP2 ($6.05)
Hero ($9.55)
Button ($4.90)
SB ($8.40)

Preflop: Hero is CO with T[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.45</font>, <font color="#666666">3 folds</font>, UTG calls $0.45.

Flop: ($1.05) 2[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, UTG checks, <font color="#CC3333">Hero bets $1.2</font>, <font color="#CC3333">SB raises to $2.4</font>, UTG folds, Hero folds.

Final Pot: $4.65

[bigredlemon]

You ought sought yourself.

He probably has something like a lower pair and or some draw and couldn't doesn't to bet out to get you to fold your AK that missed or to check/call or check raise. He could have a monster, but he could have little too. Thats not to say you should never fold, but that don't let the fact that he took too long change your mind on what to do.