Welcome @Tonipeters
Members are supposed to reply to each other within 72 hours but given that it’s the holiday season they may be occupied with other things - does it say that the message has been read ?
You may want to read similar threads where this has been discussed
https://forum.trustedhousesitters.com/t/time-for-approval
https://forum.trustedhousesitters.com/t/ths-etiquette
https://forum.trustedhousesitters.com/t/how-long-do-pet-parents-take-to-choose-sitter