I tried to increase to 100 sat/b. but the fee is almost the double. If I don´t increase the fee, how long will it take to be confirmed?
Assuming your transaction doesn't have any unconfirmed parent, 100 sat/vbyte is more than enough to give you fast confirmation. At the time I am writing this post, miners are including transactions paying around at least 70 sat/vbyte.
Two days ago when you posted about your transaction in this thread, your transaction was around 25 vMB from the tip and now is is around 10 vMB from the tip.
This means that the network has become less congested, but it's not really possible to predict when your transaction will be confirmed if you don't bump the fee.