Openings for large tournaments

Can anyone recommend a white opening and a black opening useful in big tournaments with time limit of 1 hour, 30 minutes and 30 bonus seconds per move?

What a dumb and senseless question...Sorry...

any opening is fine.  main lines are usually the best.  and better players are morely likely to know what they are doing over the board and in correspondence chess.  

something u can understand and continue to find plans and counterplay into the middlegame.  a lot of very proficient blitz players ,what they have in common, they get positions that are easy for them to play.  i would recommend john bartholomew's and chessexplained youtube channels and jan gustafsson's opening clinics for chess24 which u can see for free on youtube and if you see an opening you like go for it.  chessexplained has a far more sophisticated online opening repertoire in general but that may in part be a result of the opening they play.

an opening like the scandinavian, which john loves to play and he is probably one of the best in the world at it in some positions in it (and the few positions i disagree with his treatment i will eventually get around to crushing him :P) , black gets easy development, there are many piece configurations to choose from for both sides.  in terms of pawn structure and piece placement there is not much u have to know --- but white should be able to obtain slightly more space than normal --- this is the objective concession u pay for less work.

it depends on your preferences and how much u want to work at it.  some players try to emulate garry kasparov, memorize 10-15 moves opening theory, but get positions in which both sides get active play and plans, super dynamic stuff.

or u can play symmetrical positions which u have to also know some stuff, but usually occupying the center with their pawns and then pieces, this makes sense to lots of players and i think in such positions the better player will win.  this is the jan gustafsson approach and i think the most sensible for most players.  but he also memorizes theory up to 30 moves deep, but he is a 2650 gm for this among other reasons, although in non-critical positions where he does not have to know the correct move he will usually forget what it is.

what all the best chess players have in common, they have tried everything in their chess careers at some pt, but chess is their livelihood, u have know something about all types of positions to be the best at it.  for most people however, simply working out one opening is hard enough work.  and no matter how much work u put into it, eventually u will have to find moves on the board.  then u hope your prep and understanding was good enough that u can find plans on the board that u find suitable.

the secret to my limited success in beating much higher rated titled players is to play creative ideas in sensible positions that have their good pts and sometimes despite their chess superiority they may not play such positions as well i do.  and the secret to my failures is that i did understand what was going on too late, in positions defects in the position can lead to more problems and successes often lead to more successes.

every player has some part of their opening repertoire that is suboptimal.