Split up your play time and you will have both more success and also enjoy it more. Hoping to get a win by continuing to play for more time then its enjoyable is probably one of the most common tricks a gambler will play on themselves to no great advantage. Play the same hours but later or another day will work out better all round.
You are right, winning is not determined by the amount of time a gambler spends on playing or gambling generally, not just about slot games alone, if the amount of time a gambler spends playing games like slot had anything positive thing to do with winning, then a lot of us wouldn't mind spending the whole day every day playing no other game but slots games only..
But as a matter of fact and as we have seen on several occasions, time spent playing slot is simply spend on beinf unlucky, because it is only takes second a minute for a person to be lucky and win a life changing amount of money, I've been a place were some group of persons had spent over an hour sitting and playing physical slot machine games but won nothing tangible, but another guys walked in, choose a machine, made a deposit and started playing, and in less than 8 minutes, and shouted and jumped up from his sit, the dude had won over $8k dollars even when he haven't spent up to $500 playing.